Here, unpack this to work on and you have to put your files in a folder in Documents\BeamNG.drive\mods\unpacked\"modname"\vehicles\"vehiclename" So in your case it might be Documents\BeamNG.drive\mods\unpacked\roamerpickup\vehicles\roamer To unpack, when opened click extract all
Ive already unpacked my zip but i go into blender and hit roamer and it just shows the mod winter file Edit- dont wory i forgot to use import and thought i had to use open