A gas MH like Rich's will certainly do the job given the mods he's made. Perfectly fine for traveling locally and having a comfortable place to stay while you're at the races and doubles for a nice camping getaway as well affording easy access to state and national parks. Careful getting into a Class C with lots of rear overhang, which is why a 24-26 footers normally have a favorable wheelbase/body ratio.
In the diesel pusher category you'll see every imaginable combination of coach and trailer with 35-36 footers being fairly common and about as short as you can get with a 10K hitch (the Tiffin Allegro RED for example is only rated to 5K). Where the DP's shine is when you're faced will lots of hilly towing, especially as you get out west in the higher altitudes. Lot's of opinions (suggest
http://www.irv2.com as a resource) out there on gas vs. diesel just keep in mind that diesel coaches are going to be more expensive up front as well as maintain. Coaches with tag axles, the preferred side radiators and 15K hitches offer much better towing but again it's all about compromises and $$$. Generally a DP investment equates to lots of travel, dealing with the drawbacks of extra size/length, etc so if racing locally a Class C or Super C is hard to beat. Also on the DP I'd never purchase one without a professional inspection, you pick one up because it 'looks good' and you may find yourself with delaminating walls, leaks, ignored maintenance and a $$ pit.