My 6250 GVWR ultra-lite trailer had a delivered weight of 5326 with full LP tanks leaving 924 for cargo. I know I'm close to my cargo limit when packed for travel even with an empty refrigerator an...
With MayPop tires anything you can do to relieve stress on the tires will help to delay or prevent the possible self destruction. Proper tire pressure, covers when parked, properly sized blocks under the tires when leveling, jack stands or stabilizers to ease the load, inspection of the tires before each trip...etc all will help.