Actually, I enjoy DIY projects on our RVs. It has become as big a part of the hobby for me as actually traveling and camping. That being said, there is nothing pleasant about changing the macerator hose that runs from the pump to the side of the coach on a Roadtrek. Low clearance, tight design, lots of awful stuff coming down your arm no matter how hard you try to avoid it. Wear goggles.
Then, there is the changing of the oil in an Onan 2800 hanging from underneath the Roadtrek. Not easy. Doable, but not easy.
Working on a B is simply harder in many respects than working on an A, C or trailer. Why? Everything is compact, close quartered and compact.
I have modified all our RVs. Added cabinets, shelves, upgraded stuff, etc. Lots of fun and adventure. Notice the choice of words: adventure. On some adventures you flip the raft :S
PSW