Cool idea... could imagine the animations playing in reverse to pack up and move but I couldn''t imagine getting that to work 😅
It is somewhat possible by forcing the build state animation to 0.9, 0.8 etc with short delays in between.
Ægion's solution is very different from mine and has different pros and cons. He keeps the health bar in sync when converting the truck which is very nice, but I'm not sure if it is possible to add these animations at the same time.

(Available in my mod)