I had a Yamaha EF2400 (it's quite as a Honda and not as expensive) in a plastic type dark grey locking box,(that I bought at Lowes) on the rear bumper.The generator fit perfect.It is true you can't operate a portable generator in a fully enclosed box.I cut the whole side out for exhaust,a part of the bottom out for air intake,a part on the front for pull cord and switch.I used it like that for 3 years.You can still get it from www.wisesales.com for just under $1200.00 to your door.It only weighs 70 lbs.I wish it would have fit the generator compartment on myWarrior,it would be a lot quiter than this noisy Koler.
Good looking rig turtle!I'll bet yo have a Onan mirolite,my dream.
Good luck.....JJ