To answer you question about the difference between gasoline/diesel powered coaches.
Let me put it this way. I also made the mistake of buying a brand new 36'gasoline motorhome. Six months later I traded it in for a 38'diesel pusher. It was the best decision I could have made. If you compare them, it is like day and night different. The ride alone on the air ride diesel pusher is so smooth versus the spring gasoline coach. The power, the handling and everything is much better. So like the previous post suggested, think it over before you jump into something else that you might not like.
Test drive many different coaches before you buy.