Gen 2 R1s seeming incompatibility with EOH brakes

[kmor]

Well I was hoping that rivian would find a solution but it appear as though gen 2 R1s both T and S are not compatible with some EOH brake systems.

I have a gen 2 R1T DM and pull a nautique paragon 23 on a triple axle trailer with electric over hydraulic brakes. Since I got the truck the brakes on the trailer have never communicated with the truck. I was hoping it was a simple wiring issue on the trailer, even though they were never an issue with previous tow rig. The trailer has been looked over and that is not the issue. When plugging in the trailer the lights come on and everything, indicators, brake lights etc work perfectly, the truck recognizes the trailer etc but there are no brakes. Being a roughly 10k pound trailer + boat setup I would very much like to have trailer brakes.

Took the truck into a SC and they looked over the truck and could not find any issues, they brought the truck out to the trailer and tried to trouble shoot the issue with both. They determined that when moving from the gen 1 to gen 2 architecture they went to digital fuse for the trailer pins and that when the trailer is connected for a brief milli second the pull of the hydraulic pump exceeds the set 40 amp limit on the digital fuse and then it shuts off power to the hot trailer pin.

They proceeded to inform me that the condition has been escalated for further review and that "potentially" there will be a software update in the future to correct the issue.

I'm kind of bummed about that because who knows when/if they will ever get to that fix. This essentially means I wont be towing my boat anytime soon.

Just wanted to give others with gen 2s a heads up and like I said I'm not sure if this issue will apply to all EOH setups or if mine is unique!

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[babock]

I have just started getting interested in the Rivian R1T and am going to do the same thing you are doing...towing a boat trailer with EOH brakes.

On my previous tow vehicle, I used an F-150. It had a similar issue in that the the wiring was too small to provide the current to actuate the EOH pump. What I did with that, and likely with the Rivian, is I will run an 8 AWG wire form the 12V battery, through a fuse, back to the rear pumper and use an SB50 Anderson connector. When not towing, I will tuck it under near the hitch and hold it in place with zip ties.

My brake actuator is the Titan.

There is another option...mount a battery on your boat trailer or run a cable from the boat's battery to operate the brake controller. I have another trailer, also with EOH brakes, and I use the trailer's battery bank to operate the EOH. That way, that battery also acts as the break away battery.

 

[babock]

Another thing I though tof that may be the best solution. You can buy 120V 12v chargers that are 30A. Victron makes a good one for around $180. You can plug i tinto the 120VAC outlet in the back of the vehicle and run it to the the 12V EOH pump through a connector.

I am assuming you plan on using a weight distributing hitch with your boat right?

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