USA Trailers Pack v1.0

USA Trailers pack v1.0 by David Corley, Solaris36 & Stewowe.

Modifications (by Solaris36):
Gathered all trailers skins in one mod.
New cargos.
Lowered prices (more realistic).
Added all trailers to a.i. traffic.
Added license plate light.
Added side blinkers lights.
Modified light mask.
Modified axis width.

Only trailers: Eagle, wolf and Pumpkin not included