You have a lot of fuzzy math in there and IMO poor estimates.
The Hi-Lo company specs the trailer weight is 5750 dry and without optional accessories (Rough guesses - 50 for an A/C unit and 100 for an awning = 5900), that puts 4700 of that CAT scale weight on the trailer axles, and leaves 1200 of it loaded onto the hitch/rear axle of his vehicle
That seems hard to believe, 1200 pounds of hitch weight. Maybe he wasn't using a WDH and saw 1200 pound increase in rear axle weight. If accurate, your receiver is not rated to handle it.
Still, 5750 dry spec weight, 6700 pounds loaded for a long weekend, 7k tow rating, too close.
80% rule is a guideline many people recommend because they do not do the math and/or underestimate weights. Where did you get the 6526 pounds of the loaded Ave from? How much payload does the Tire and Loading sticker say you have on the driver's door or door jam?
