If that is a measured weight, then it is 74% of the tire set maximum and I would not be worried. I remember your previous thread and had looked up the specs on that camper
as having around 7000lbs gross on the tires. Since the dry weight on the tires would be around 4000 then I guess you could be at 5400 loaded.
My previous TT had Chinese 'Nanco' tires and after a very early failure (which was, I think, due to rolling off the bead in a sharp turn backup) the spare plus the rest of them lasted 9 years until I traded in the trailer.
Just be sure to check for 50psi cold at the start of every trip.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam