Since we're griping - I totally forgot about my most recent conquest: water pump on a new-ish BMW 330xi. It's electric and jammed up on the bowels of the engine bay. You have to get it from underneath, and you have to have the hands of a small child. There were a couple of times when I was border-line panicked because my hand was wedged and I couldn't get it out. You're unhooking and reattaching clamps totally blind. Steering rack needs dropped down to get clearance to get the pump out. And it's not that big. I was talking to a friend of mine who said "at least it's not an Audi - you have to remove the entire front clip!"
The more complicated things get, the more junk (wiring, plumbing, electronics) they need to jam into a small space. Remember when you'd work on a car, drop a wrench and it would actually fall to the ground? Those were the days.
My Allegro's 454 only has 2 wires of any consequence - one on the alternator and another at the ignition module. There's another pair for the oil and water temp senders. That's it. Big old Quadrajet and spark plugs that I can not only reach easily but I can SEE them!
Back on topic - looked at my tanks. The gray is just hanging from the bedroom floor with straps. Shower and sink plumbing appears to be easy to remove (cut). Black tank is similar, though the toilet flange is glued on. That would need cut out, perhaps requiring a new tank or some creative plumbing.
It's not that I wouldn't love to have a newer coach, but this old one suits me (and my budget) just fine. I love tinkering with stuff.