ffryebird, in thinking more on a WDH, that might not be an option for you.....it might be a necessity for your setup. Since the Expy is built on a F150 frame, I will use my truck hitch setup as an example.
I presume that you got the 448 lb. tongue weight from the stats somewhere. Add 60 lbs. of propane, and a 50 lb. battery on the tongue, and you now have 558 lbs up there. And loading for camping will probably put even more weight up there....and that is not bad, as a heavy tongue makes for better towing. But, my hitch is rated for 500/5000 lbs. (tongue weight/trailer weight) with a weight carrying setup, and 990/9900 lbs. with a weight distributing system. So to keep everything by the book, you will probably need a WDH.
If you crawl under the Expy with a flashlite, there should be sticker somewhere on the hitch that gives all of the rated capacities. These are just hitch capacities, and not vehicle capacities.
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