Mr. CountryB,
My brother and his wife had a 2014 Tiffin Allegro RED (Rear Engine Diesel) with four slides. Nice coach but in that price range you will get a rear radiator (no biggie, just keep it clean). They moved up to a 2015 Tiffin Allegro Bus (side radiator), both coaches with four slides.
Tiffin also makes the Allegro Open Road (gas model), but with four slides, you could get close to max weight. I follow a thread 'www.rvlove.com'. They have an Allegro Open Road gasser and full time in it. Good blog. They added Sumo springs to get a better ride.
The plus with diesel coaches is that you have an air bag suspension and air brakes. Coming down a mountain or long grade using a jake brake is a life-saver. Our current has a retarder which is a little stronger than a jake and has six settings. But, we weigh 55,000+ lbs. and it is needed.
Once you look at the upper end coaches, life will never be the same. Remember, happy wife, happy life! LOL!
Safe travels,
MM.
