We ended up going with a shorter class C with a pretty good sized slide, and a longer wheelbase (rather than the very long extensions noted above). It is a 2005 E450 chassis, which is rated at 14,050 GVW and 20,050 GCVW. I went with a short C to minimize the weight of the coach, and leave room for a decent size trailer down the road. This is a long way of saying, don't go with a C unless you can deal with (or in our case want) a shorter MH. The As should have more weight capacity headroom.

Added a reinforced hitch receiver, and it did fine pulling a buddies 26' enclosed on a 5k mile road trip this summer over the rockies and back with a car and parts in it.

The Ford v10 is a good towing motor, and the 05+ trans is decent as well (though I am adding a custom programmer to improve the shifting logic - it holds gear a bit long in tow mode, and does not always use 4th when upshifing).