Hiya. So here's my story: I got a bunch of mods, trying them all out, and when I loaded the game up the default Gavril D15 V8 (or whichever truck is the one that spawns first by default) has been changed to a truck without any top whatsoever (as in no windshield or windows or anything in that area) and the bed has two seats in it now. Spawning in any other D-series results in the exact same truck. I've no clue as to what happened, but I deleted any mod that might be using the Gavril D-series...
Gavril D-Series files messed up.
Gavril D-Series files messed up.