Most Gas MH's are built on the F53 chassis which is used on everything from motorhomes to bread trucks. It's a utilitarian chassis and thus not a lot of engineering around comfort and quiet. Diesel MH's are fairly specific to the task and engineered with driving controls and comfort with things like airbags. On a gas MH you are sitting on top of the engine and endure all the noise and heat that it brings. Diesels are rear engine and so much more quiet and balanced. There are reasons DP's cost more and most of those reasons are the chassis, engine and engine placement. They are also typically built a little better with higher end components and insulation. All of which add to the experience. But everything in RV'ing is a compromise. You have to decide if the extra cost is worth it. Most folks who end up with a DP, never look back.