This is especially ment for the truck trailer coupling system, as that's where my know-how is but it could also be used for the normal car trailers. So, what I've experienced in making semi truck (+ trailer) accidents, is that the trailer comes off way too easy and it gives the accident just a little bit of an unrealistic outcome. For example, I have experienced the trailer coming off in a simply head-on accident with a car which wouldn't happen in real life. My suggestion would be to make the coupling stronger, so that it would be a lot harder for the trailer to actually come off. Reference: (0:08 truck falls to it side, trailer stays on, 0:23 multiple colisions, but trailer stays on) It was hard finding youtube videos showing how strong truck trailer couplings are, but those 2 examples shows it good enough I suppose. Hope you'll take this into considerations, when you'll find the time for it.
this I am hopeing they can update it to be stonger cause I am trying to make realistic semi truck spinouts from trying to avoid a crash or someing and what I get is a trailer tiping over the smallest bit and it comes off