It has been 11 years since the purchase of our first diesel motorhome. We had the same experience. I drove a few gas models and then the diesel. What a difference. We put 1000 more hours on our propane generator over that period of time and it does make you think ahead about procuring more propane. Our propane generator finally broke down for good, so I bought a Honda generator that I mount on the back. It is way more fuel efficient, more quiet and easier to find fuel for it.
You are learning the Ins and Outs of these wonderful machines, so you'll be a pro in no time.
Tip: It doesn't matter if an RV is new or old, they will always have something in need of attention. Usually there are no show-stoppers, but small problems can add up to a big problem fast. Have a Fix List handy. Write down everything that needs fixed when you get home. Fix it before the next trip. Resist the urge to pay a mechanic it or you'll go broke fast. A slightly handy person can usually fix most things using the search on this forum.
Happy Camping.