I made the folding parts pack addition to bridge that gap, a little bit. I actually considered making EVERY part foldable for the same volume as the part when it is removed, but 1) that would be a pain, 2) it’s probably not REALLY necessary, and 3) I don’t think the devs would include it.
The ability to make some kind of vehicle-holding space in a vehicle would also be pretty useful, and it might be easier to implement, really (based on how wrecks exist with multiple frames in one space, and such). I’d dedicate 3 spaces on the back of my vehicle to holding a bike for scouting…