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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
What year is your truck?
I get the feeling you have not touched the brake when this occurs, correct?
Do you ever get these warning lights when not towing?
Was the diag for this U code done and were any repairs for it done?
For the trailer to be to blame. The trailer would need to have a wire shirt and back feed power to the tuck on the electric brake wire or the right or left stop turn lamp circuits. Since you said this occurs with the brakes not used that means the left and right stop turn relays are open and the electric brake feed only goes to the brake control. Neither of which could cause the truck to receive a brake signal input and trick the EBCM. I can not see the trailer to blame for this case. I think its the EBCM to blame in this case and its telling the brake controller the brakes have been applied thus the controller applying the brakes. My suggestion is to start off with a new EBCM on the truck. If this occurred more often i would say to hook RV to another truck but 6 times in 2 years, that is going to be impossible to duplicate.
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No problem, camping and hiking myself in TN.
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