I wouldn't say don't worry about it, but there may be nothing wrong, just an imbalance in load. Here is what my F350 weighs, empty and full:
Empty LF2340, RF2140
LR1860, RR1660
Note that the left side is heavy by 400 lbs, fuel tank was full and on the left side.
With camper LF2120,RF2430
LR3920, RR3920
Evened out in back but heavy right front. Galley is on the right. The truck will list a bit to the right with the camper unless I correct it with pressure in the airbags. It's more difficult to weigh the camper on its corners, but the above suggests that the camper is perhaps 500 or even 700 lbs heavy on the right.
When the camper (Bigfoot 10.4) is on the ground, you can raise one rear jack clear, however it will noticeably flex the camper to do it. The easiest way to see this is to watch the door frame wrack by watching the lower free (non-hinge) corner of the door in its frame. It will move +/- 1/2" up or down. Since I unload and store it on uneven ground I watch this as my gage for jack pressure.
The spring rates on the rear axle are around 1100 lbs/inch, so 1/2" off left to right will result in an 1100 lbs imbalance in the measurements (+550 or one side, -550 on the other). That makes it pretty easy to get an erroneous measurement. I measured mine in the same spot moving only the scale - but it's still hard to guarantee everything is exactly the same.
