Most of the time no matter how capable and perfect the truck is, the trailers always inhibit the performance due to only having either highway or other basic tires, extremely low ground clearance( which make them drag terrain often), very stuck-y frames (which get stuck to other models and props such as trees, rocks, mud, buildings, gates, etc. 
Trailer customise-ability could be either very basic or scoped.


Basic implementation could include:

=>Tire class options (like trucks)
=>Ground clearance lift (suspension if trailers have it)
=>Color palette.

Further implementation scope could include:

=>Steerable axle (like in HCT trailers where rear end wheels are free steered)

=>Articulated or turnpike trailers because a chain of two half size trailers is way practical than an ultralong 8 slot which is obsolete in use unless a single cargo is that big. Articulated or "bendy setup" provides more strategical turning and driving in general for Snowrunner. Of course the chain shall be max of 2 trailers for implementation within scope.

=>Trailer lighting. Currently only whats directly ahead of the windshield is visibly lit in the night or dark, even the beacons dont "project" light (like headlamps) they just glow orange. Having some "ambient" lighting on whats behind the cab is very realistic and practical. For example small chrome lights lining the edges of trailers which lighten up the terrain below is more than enough. Only the terrain below them.

Thank you for this awesome game and the season dlcs, cant wait to drain my time into it.😉