https://www.beamng.com/resources/monster-pack-offroad-grand-marshal-and-200bx.2000/ Not sure if it still works, but here you go
https://www.beamng.com/resources/the-offroad-van.3709/ https://www.beamng.com/resources/the-offroad-barstow.3136/ https://www.beamng.com/resources/offroad-burnside.2208/ https://www.beamng.com/resources/the-offroad-moonhawk-pickup.1968/