I hope all is well with you, your family and the build on your home.
I have asked Bryan at Alaskan to use the DC Airco as first choice and the DV Breeze as second choice. I am really hoping they can find a way to make it work as it will be just the right size for a truck camper and draws so little power compared to a regular ac that it could run off a 1k generator in a pinch. Our current generator is a 3k Yamaha propane and it is simply too heavy and cumbersome to be used day to day use.
We are putting a box under the flat bed on one side and the propane tank under as well on the other side, if room allows, a box in front of the propane tank.
The camper will be pretty much permanently mounted to the flatbed. The current camper we are using has only come off twice and that was to have the camper worked on. I am planning on using some sort of elastomers with the U-bolts to attach the camper to the flatbed to allow for the slight flex of the bed.
Lastly, the Ute bed is aluminum and weighs in at 300 lbs (less than the current bed, the camper will be around 2100 lbs. So not much heavier than the current camper. Fresh water will be larger, but gray and black less because we are using cassettes for both of those. Not much more weight as far as I can figure, but still a lot for a one ton truck. One of the reasons a F550 is in our future.