[Brys]

Is there any possible way to freeze the vehicles up on an object to avoid letting them fall?
SS:
http://imgur.com/XcKZzSE

[Lucky13]

Yes it is. You can create a flat big object under the vehicles and make it transparent.

https://sampforum.blast.hk/showthread.php?tid=492017

That link will help you to set the flat object material color to be transparent