I’ve finished the game and am playing through side missions and whatnot, including getting missing vehicles upgrades, but the vehicles spawn like one of 2 then nothing if they even do that
I think there may be more spawns in specific areas related to specific vehicle-related missions. Generally, though, it seems to be more a case of knowing where the spawn points are and deliberately triggering them.
I have gone to every map multiple times and just drove around for a while and got one vehicle to pop up if any.
Try looking specifically for the garages with a black opening where you’d expect to see a door or interior texture.
What vehicle types are you looking for specifically?
At the moment the flame boost