Bev and Keith
It sounds like you know what you want but I would recommend a test drive before you buy it. That would quickly answer most of your questions first hand. We have had both and really love the diesel as we find a huge difference in the ride. Without the air bags we found the gas unit leaned out from the turn instead of into the turn. That always bothered me. The diesel is a silent smooth ride. The gas is noisy because the engine is up front with you. With springs you feel more rough spots in the road. We found the gas to have enough power but it is a different type of power. We had no problem taking it over the Rockies. It was not slow, it was just noisier which is not a big problem. The torque of the diesel; you know what that is like. Brakes, yes we did go through them on the gas burner. Mileage on the diesel is a little better but diesel costs more. The fiberglass roof is something that we love. Have never had a problem with it and it washes very easily and is not slippery to walk on. We did find that the wind had more of an effect when it hit our gas coach. Both are good and serve their own purpose. For comparison purposes our gas unit was a 2005 Allegro Bay which we really enjoyed. Like I say you know what the diesel is like. Do a test drive in a gas unit and even test it out on a good hill and then decide. Good luck with your decision.