Looks like you have an E-450 (14,500 lbs GVWR, and 22,000 lbs GCWR)*.
The first thing you should do is take it to a scale and
get it weighed--that will tell you how much you can tow (you probably have the 8,000 lb hitch) the amount you can tow will be the lessor of the hitch rating or (GCWR - scale weight).
Once you get it weighed you'll know how much you can tow, then your next decision (if you haven't made it already) is flat tow or dolly tow. From there you can figure out the vehicles you can tow (unless you already have a vehicle in mind--if you do look in the owner's manual to find out if it can be towed).
That should get you started down the path of figuring it out....
* GVWR = Gross Vehicle Weight Rating, GCWR Gross Combined Weight Rating.
Thor Forums
