This mod replaces the mule van's back to an enterable version so you can lift yourself there or a vehicle.
Open gta3.img file with any img editor and find the file "mule.dff" and replace with the one in the zip. Then rebuild the archive.
The dff is locked and that means you may not edit it. This modification is exclusive to gtagarage.com so you may not host it in
any other website especially without my permission.
The back of the van is not fully solid to static objects.
Enjoy my mod ))