I rethought the idea of towing with the bumper and realized to do so, with the current trailers I have (which aren't offroad models) I'd need a drop hitch of 8" or so, which is a bit excessive in my opinion. Also required, would be to cut the tail off the hitch, so there is no more than about 1" of metal left behind the hole for the pin that secures it to the receiver.
And I already have enough ballmounts in my collection, and one with a large drop would only see limited use.
I started looking for a hitch again, and in very short order I FOUND ONE!!! (one that bolts exclusively below the frame and doesn't use the holes on the side, which are used up by my frame tie-ins)
It's made by Curt Manufacturing, It's the model 13408.
I've ordered stuff from etrailer.com before, and they have free shipping if you order over $150.00.
http://www.etrailer.com/mm5/merchant.mvc?screen=PROD&Store_Code=E&Product_Code=13408
Supposing I ever go to Moab or other places where I'd need the clearance, (lots of places in Moab where'd I'd drag the hitch across the rocks) I'd simply take the hitch off.