I’m new to this forum/page. I have a 89 Toy pick up long bed 4x4. I was wondering if it’s possible to swap out the single cab body and put on a extra cab body (same gen pick up) instead

 

In a nut shell, it wont be bolt on. The rear cab mounts are in a different spot and the crossmember would get in the way of the cab. Then the bed will have to be shortened or the frame, and everything under extended.