From the photo above we can see that the XPCamper's departure angle
is not very great. The rear of the flatbed may touch the ground when
making the transition from flat ground to steep uphill.
Personally, I have no problem with this. I'd gladly trade some rear
clearance for the extra space in the interior of the camper. Others may
prefer a design with a shorter rear overhang that maximizes clearance
at the expense of space in the camper.
It will be interesting to find out if the builder, Marc, has plans to make
the camper available for use on a pickup with standard cab. That would
allow the flatbed and camper to be mounted farther forward, reducing
rear overhang.
Each camper design has its strengths and shortcomings. It's a matter
of choosing what features are important for your intended use.
Chip Haven