(Zmodeler 3) Making wheels from scratch

Hello, I’ve been starting to dip into vehicle development with zmodeler. The way I’m doing this is by taking trailer props in game, and making them working, attachable trailers, however, I’ve been copying the wheels over from the small trailer already in game and it works great. However, I want to detach the wheels from the existing prop and make them work from scratch. I’ve tried and tried, but it just crashes my game when spawned. Anyone have a good tutorial for beginners on this? Thanks!
Edit: I already tried asking this on zmod’s forums, they gave me some long winded answer that basically just said they can’t help, and frankly don’t care.