Semitrailer M747 with sidewalls

Semitrailer M747 with sidewalls
you can now put trucks on trailers and wont fall off
this mod has 2 different M747 trailers with sidewalls
one is short other is tall
added chain tires
so i was looking for a way to add side walls to trailers. default addons dont work on trailers, but i tried wheels and it work trucks dont fall off
i did try the other 2 trailers with ramps but they have a problem even in normal game play they glitch out and fly around