I agree with all the statements here. I should clarify the reasons for the small RV instead of a panel van 4x4 conversion or a pickup truck.
2 guys, who will not be sleeping together, and one big Labrador. I may have made it sound like a solo journey which is not the case. As for the budget I dont think im too far off, but I would love to be corrected on that. yesterday I found a set of bilsteins for E350 motorhome for $400 a set. Combine that with heavy duty rubber bump stops and load balancers and maybe a new set of rear leaf springs and im still well under 2k. this wont give me any extra clearance but it will provide a much more robust ride. Im also lookign mounting a dual dirtbike ramp rack on the back of the home. This poses alot of other issues. Mainly support in the rear of the RV. Wet weight of 2 bikes would be around 850 lbs. that doesn't seem impossible to me. they mount that much to a trailer hitch all the time. I have seen rear spring helpers that could be installed to mitigate the extra weight
Interesting point made about the rear wheels and being able to gain clearance. Would you be able to do a "body lift" and insert metal beams to essentially raise the house part up? that could be an easy way to gain some extra room.