Originally Posted by mountainsam
Specs say up to 5000 pounds for a toad but I realize that is the rating of the hitch, not nessissarily the rating of the coach.
You are correct.
The Gross Combined Weight Rating (GCWR) of the diesel Transit I believe is 13,500 pounds.
If you're loaded down fairly high as I expect you may be (relative to 10,360-pound Gross Vevicle Weight Rating), then you're probably limited closer to 3,000-pounds instead of the hitch's 5,000-pound rating.
As first step I'd weigh the rig fully loaded and see how far you are from 13,500 pounds.