I am confused.
You have 4 tires according to the white sticker and 6 tires according to the yellow; yet both call for ST225/75R15 load range D tires inflated at 65 PSI
With load range D tires inflated at 65 PSI each tire will support 2540 pounds.
The front and rear axles are rated at 5080 which is correct for 2 D range tires on each axle.
The max gross weight for your camper is 9891 and at the worst case loading (for the trailer tires), 15% the axles would need to carry 8410 pounds total or 4200 pounds per axle and 2100 pounds per tire.
While it is true, that your camper (if the yellow sticker's GVWR is correct - and it may not be) can "get away with" Load Range "C" tires inflated at 50 PSI; the specified load range D tires would be much safer.
HOWEVER, IF you have load range E tires on your camper you are double over sized. Something is wrong and you need to contact FR to determine WHY your new camper was shipped with double over range tires or if the yellow sticker is incorrect for your camps's model. (which I suspect). There is a good chance that when your camper was built, they were out of Load Range D tires and slapped on Load Range E just to get the camper out the door.
Only a call to the factory with your VIN will tell the tale.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW