Host mammoth on 3500 HD 07 Chevy dual rear wheel

Remember that even though you consider yourself spoiled on really huge rigs and will only be happy in the very largest camper in existence, you might be unhappy trying to drive it!
I like the 11-footers myself and wouldn't want to go shorter but there is a point where it starts to suck to be THAT heavy.
You could also downsize to a small trailer and still have more room than a truck camper, with none of the weight issues. Heck you'd have more truck than you need, you'd be LIGHT!