Gsetter,
I have run the generator while driving to keep the coach cool with the overhead A/C on very hot days. It worked fine, and it certainly keeps the coach cool enough.
The twin beds may or may not work out for your use. The passenger side bed has an outside storage compartment so you might be able to completely remove the bed and put your crates there. The driver side bed has utilities underneath - so you may not be able to fit the crates on that side unless they fit under the overhead cabinets within the existing space.
The couch is small but could be used as a bed, perhaps by one full sized adult or two children. I am 6'2" so to use it as a bed I would need to swivel the driver's chair around and rest my feet on that. I've tried it and I think I could sleep there okay.