We always marveled at the senior ranking folks who had little ones ...we had our little ones early in my career, and managed to get them all working and almost self-supporting by the time I retired a year ago! The boys should enjoy the experience, especially if they can have their own little jobs to contribute to setup and teardown. I created checklists for myself and my wife, both outside and inside, so we wouldn't forget something important. You could create little checklists for them too, appropriate to their age levels! We had our 7 yr old grandson with us for over a month, and by the end of his time with us he was putting his bed away each morning without any input from us, and learned a lot about how to help me in hookup and unhooking when we moved.
I've known of a few folks who figured out how to put bunk beds in a motorhome ..converting a closet in one case, though I don't see any way to to that in ours. I have heard recently that some mfg's are making more family oriented rigs. Sorry I can't point you to any.
Enjoy the planning and transition!
Paul (KE5LXU) ...was fulltimin', now parttimin'
'03 Winnebago UA 40e / '05 Honda Odyssey toad