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Hi All, I'm a little late to the thread, but I too have had a hard time finding any definitive info on flat towing a 4xe. I just got back from a 17 day trip towing the Wrangler, so I thought I'd summarize what I learned here.

tl;dr: It tows like any other Wrangler, but needs some adjustment to supplemental braking systems and a source of 12V power while towing.

The Good Part:

1) No special concessions are needed for the hybrid drive train. Once the transfer case is in Neutral, the 4xe will tow exactly like a regular Wrangler.
2) I used the Blue Ox baseplate for a JL Wrangler and the Blue Ox plug and play wiring harness for the tail lights. Everything installed with no modifications and the blind spot/cross traffic alert from the tail light sensors wasn't affected by the harness. Any flat towing baseplates and accessories designed for the JL should work fine.

The "Not bad, but needs to be taken into consideration" Part:

Supplemental braking is a bit touchy. I use a Brake Buddy Digital Classic for my supplemental braking. It's designed for a standard ICE setup that includes a vacuum brake booster. When the Brake Buddy starts up, it pumps the brake pedal 5 times to clear the vacuum reservoir of the brake booster so that it doesn't lock up the wheels when the braking pressure is applied to the brake pedal. The pressure setting I used on my 2018 Sport was 65 PSI. According to the weight/pressure table for the Brake Buddy, I should be using 75 PSI to compensate for the weight of the 4xe.

I set it to 75 PSI and did a test stop from about 15 MPH. I received instant whiplash, the forward ejection of all loose objects in the RV, and the "what did you do?!" glare from my spouse.

It turns out that the 4xe has some sort of electric brake booster that is always active and will always work, even when the engine is off. As far as I can tell, there isn't any way to disable it, so you'll need to compensate by having your supplemental braking system of choice push the brake pedal much more gently and with barely any travel. In my case, I now set my Brake Buddy to 7 PSI (it sometimes drifts as high as 12 PSI) so it barely presses the pedal a quarter of the way when it triggers. This worked well for slowing the Jeep and the coach without locking up the wheels on the Jeep. I'm not sure how you would compensate on a fully mechanical system like a Reddy Brake, or other cable driven system unless you can adjust the amount that the cable pulls on the brake pedal.

A side effect of the electric brake booster is that it consumes power from the 12V battery on the Jeep. (Side note: I'm running the Brake Buddy off of a Jumper battery, not the Jeep battery, so power consumption isn't coming from the Brake Buddy) If I tow for a single day and unhook the Jeep and drive it around a little before the next day of towing, I don't have any issues. If I tow for two days straight without unhooking the Jeep, I see the following errors consistently:

1) The message that the battery is charging and the Aux switches are temporarily disabled - This goes away as soon as you run the vehicle for 20-30 mins and let the 12V battery charge while driving.
2) The message that the Stability Control needs to be serviced and the yellow Stability Control error light comes on - This clears within 5 minutes of driving the vehicle
3) One time I had a check engine light come on as well - This cleared after three successful start - run - stop cycles

It seems that having the 12V battery drain significantly while the Jeep isn't running makes some systems pretty angry. I'd recommend adding a battery tender that feeds off of your 12V line on the trailer plug of your RV. I'll be doing this soon in the hope that it will keep those errors from happening.

Hills

I saw some other posts asking about how the extra weight of the 4xe would affect towing up hills. We did some mountains in Wyoming and Montana. I have a Coachmen Mirada on a Ford F-53 chassis with the Triton V10. Probably one of the the most common Class A platforms out there. On a 7% grade, I was able to maintain 45 MPH climbing the mountain. I'd probably consider that the steepest you'd want to climb with the gas V10. Due to an oversight of navigation, we ended up climbing a 10% grade one time. I barely kept it at 18 MPH. I don't recommend trying that. Downhill isn't a problem with the V10's hyperactive downshifting in Tow/Haul mode. On a 7% grade, the engine braking alone did a good job of maintaining speed. On the 10% grade, I had to do a lot of braking (and consequently used the Jeep's supplemental braking a lot as well).

I hope this info is helpful for anyone still looking for answers about flat towiing the 4xe.
I am trying to use the Blue Ox BX88368 EZ Light Wiring Kit for Jeep Wrangler JL brake light plug and play wiring harness and all I get is a flicker in my right tail light. Which Blue Ox wiring harness did u use? Did you have to do anything special…I think out 4xe have LES lights…could this be an issue?
 

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4000+ miles towing our 4xe with Demco Duo brake system set at lowest setting. No problems from Ohio thru Colorado, Wyoming and Montana towing with our Thor Hurricane 29 M in Tow Mode to use engine to slow on down grades. 4000 foot downgrades at between 50 and 55 mph.
Connect Jeep, back it up to lock the tow extension bars, put in neutral, shift transfer case to N, place in Park, parking brake off, Demco Duo switch ON and shut off Jeep. Five weeks of travel and all is good. Even forgot toswitch off Demco one night. No issues.
Which brake light wiring harness did you use? My BX88368 EZ Light Wiring Kit for Jeep Wrangler JL is not working?
 

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Discussion Starter · #44 ·
Just finished a 7000+ mile, 45 days, trip from Arizona to Boston and back towing my 4xe behind a Renegade Valencia.
i Am using the Blue Ox Avail 10k tow bar, with the Blue Ox Patriot 3 brake controller.
‘Some observations:
1. I used the same procedure as a standard Jeep to set up my 4xe for towing. Start the engine, transmission to Neutral, transfer case to Neutral, check dash for ”N” on transfer case, place trans in Reverse, if Jeep does not move, place trans in Park, kill the engine. Check dash for “N” and “P”. PS make sure the driver’s door is closed during this procedures or the tranny will set itself to Park.
2. I ended up setting the Patriot 3 to Level 5 braking, even though it has a “Hybrid” setting.
3. If I towed for one or two days straight, without dropping the Jeep and running around town, no problem. First time I towed three days, halfway through the third day, my 12V battery discharged completely, flat no charge. Had to jump the Jeep to get it started. Everything worked fine after that. BTW, the High Voltage battery was completely charged when the 12V battery discharged.
4. If you use the Patriot brake controller, make sure it is adjusted per the instructions, so the brake light does not stay on all the time. Seat not touching the back of the controller, screw pads all the way in,

So #3 above appears to confirms the 4xe has active braking while towing.
Next time I am looking at two or more days of towing, without dropping the Jeep, I will pull fuse F34 and see what happens.
 

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Have you tested out your controller yet?
I towed our 4XE with the Demco Duo from Ohio to the Rockies and back behind our Hurricane motorhome. 5000 miles, no issues. Camping World installer set the Demco to the lightest setting as he was told the brakes are active even when the Jeep is OFF. I accidentally left the Demco Duo on two different overnights while travelling with no battery issues. I have not installed a 12 volt line from the motorhome yet - might in the future. One thing I noticed after towing for two days without turning the Demco off - the Jeep fired up immediately in Hybrid mode when we unhooked. Perhaps it responded to a lower battery, but no issues. As a matter of fact, the Demco only draws power when you pull the break away pin (verifying it works in a catastrophic event). Also, the tech reminded me that our Hurricane has an 18000 GVW and the Jeep is about 5000. I had no issues while going down 7% grades with the Tow Haul button on. It's not the same as braking like when I was pulling a 10000# trailer with my 6000# Silverado.
The tech suggested firing up the Jeep each night after towing as a precaution, but obviously, I didn't do that, although we usually unhooked and went somewhere at each stop.
All in all, the set up was great.
 

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I have a Jeep JK that I have towed over 100k miles but want to replace it with the hybrid Wrangler. I've never used a brake with the old one...is the Hybrid that much heavier that a brake is required? I have a tag axle 44,000 lb bus. Thanks! (my province doesn't require a brake on vehicle tow.
 

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I got this yesterday from Jeep C/S
See Instructions:

I did look more to see if the active braking can be disabled while flat towing and it can by going into the settings on the Uconnect screen of the Jeep 4xe and selecting the Safety & Driving Assistance and then selecting the Forward Collision Sensitivity — Located In Automatic Emergency Braking Submenu. Once that is selected, the Active Braking should not happen when applying the brakes while driving your RV.
 

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Hey Gang! first post here... I set my 4xe up for flat towing over the week end. I went with the NSA Ready Brute Elite 2. If you are not familiar with that, in short, This unit has has a cable that attaches to the brake pedal arm and this cable is pulled by a small lever on the tow bar that is moved when the towing vehicle's brake are applied, which in turn, applies braking to the towed vehicle. I went this direction- thinking that I wouldn't have to use battery power while towing. Sounds like that is not entirely true, based on what I read in this thread. I don't have an issue with throwing another $100 at a battery tender so that- A) I don't have to worry about losing any power steering mobility from the Jeep while towing (assuming I pulled the F34 fuse). B) I don't have to be concerned about the battery charge level, when I get to my destination. Am I missing anything? Thanks everyone, Randy
 

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Just flat towed my 4xe home from Camping World Richmond Indiana back to Columbus Ohio after tow conversion. Nighthawk tow bar with Demco Duo brake.
Issues: they installed an LED light bar for tail lights due to voltage discrepancy on tail lights.
also no method to create an LED dash indicator that the Duo was activating. Tech rode in the Jeep to verify it worked. Very low setting since the Jeep brakes were active even when “off”
120 mile ride home with no issues. The Camping World tech and parts guy were great. This was their first hybrid Jeep conversion. They called other stores for advice and the others said they won’t touch them.
the parts guy was a former Jeep tech with 4xe training so that helped.
it took 2+ days for the conversion but it all looks great.True test comes in two weeks as we head to the Rockies.
Interesting! Did the Low voltage discrepancy on the taillights result in a check engine light being triggered? I might be having that issue now.
 
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