I downloaded some mods for a new B42 Playthrough, this being one of them. eventually in my save I found a trailer and a Semi, so I took the Semi to where I had found Trailers to hook it up. I used it for looting and then went to bed (I believe it was only after I put a couple hundred pounds of loot in it, but at this point I have too much ♥♥♥♥ in the trailer to test if this happens with nothing in it) and when I woke up the truck and trailer were almost Jack-knifed. I had left the key in it so I thought maybe that caused some weird interaction even though I hadn't left it running, and didn't think more of it.

However once I got to my other vehicles I had left after finding the semi, I was transferring loot from them to the semi trailer and I noticed the trailer was moving away. In the middle of transferring all the loot from the freezer truck I parked about 2 feet away, the semi trailer suddenly went out of my range and it stopped transferring loot.

After this happened I quit, backed up my save and disabled the easier towing mod thinking this may be causing an odd interaction. This didn't fix it, and upon loading the next time I took a clip of the trailer and truck moving themselves while I was in the driver seat (this happens regardless of if I am in the vehicle or not) then I detached the trailer, and the truck stopped moving but the trailer kept moving on its own.

I had stored a tiny amount of loot in the trailer before I found a truck and it had never moved sitting there on its own. I did not notice the issue until I had hooked up to it and put several hundred pounds of loot in it so I'm not sure if the amount of weight possibly has an effect, or if it just started once I hooked a truck to it.

I can upload the clip/take any other clips or screenshots if needed for figuring this out