Truck Select Menu Not Working

[HockeyR0cket]

I downloaded the 2015 blue thunder truck and installed it like normal. I started up rigs of rods and selected a map, and when it went to the truck select menu no trucks showed up and on the bar with an arrow it showed the name of the map. I don't know how to fix this can anyone help? I'll try to get a screenshot soon.

[HockeyR0cket]

By bar with an arrow I mean the button where you select the type of vehicle- off-road trucks, street cars, etc. EDIT: the box says "Addon Terrains" not the map name.

[LordFrosting]

1) Use the "Edit" button when convenient for everyone, like now.

2) Extract you smv4.zip into the vehicles folder. This prevents this issue. If you don't want to extract it, clear/regen the cache in the config