I guess it depends on the definition of "uneven." If it is relatively flat overall grade but 2 or more corners are not at the same elevation as the odd jack, then I use just only the minimum number of blocking items such as 2x10's, 6x6's, or screwed together multiples of 2x12's.
If by "uneven" you mean sloped then it really depends on the severity of the angle. For me, a slope of more than 6" on the side-to-side direction is too much. If it is sloped on the long axis then I am going to stay as far away from 10" difference as best I can.
Rarely do ever sleep in the camper when it is off the truck. In those few occasions, when I do, the TC is on level ground or I not staying in it.
Sold the TC, previous owner of 2 NorthStar pop-ups & 2 Northstar Arrows...still have the truck:
2005 Dodge 3500 SRW, Qcab long bed, NV-6500, diesel, 4WD, Helwig, 9000XL,
Nitto 285/70/17 Terra Grapplers, Honda eu3000Is, custom overload spring perch spacers.