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...
Shouldn't have flat spots after only four months. Next winter put an extra 5 lbs of pressure in the tires after you get to the campground. Also remember that some of your weight is sitting on the tongue, not all on the tires.