I've read many pusher buses have a pretty hefty frame under the engine to the rear bumper, on the bus forums it's generally considered that they can pull thousands of pounds with a proper hitch. Of course I'll consider that when looking at buses.
RE pusher is kinda a must for me, for reasons of underbody storage space, driver's noise levels, and weight distribution. I'm tired of getting stuck on wet grass in my front engine bus bc there's no weight in the back!!
"Escape pod" bucket mounted in the back suffers issues with the engine being back there too... I dont want to have to remove too much to work on it!