The need to spend a couple of hours to access the unit to do the needed annual maintenance is a clear example that the RV industry has essentially zero concept of Quality Design Engineering. Much as Detroit in the 70's till they got their but kicked by numerous foreign car companies who understood what the word "quality" meant. The inability to service the spark plug on GM Monza without unbolting the engine mount and jacking up the engine, is a perfect example
Maybe some day there will be an RV manufacturer who will make the break-out move and build a quality RV, you know one that doesn't need a trip to the factory to fix all the screw-ups they made when they designed and assembled the thing the first time, or leave cans of spray paint under the floor to roll around or wires that don't connect, or inaccesible water pumps or water drains that empty onto electric connections etc.
I bet that if the RV mfg had to eat the cost of gaining access to the various components to do the required maintenance or actually were responsible for their assembly screw-ups, it wouldn't take too long to fix the situation.
If I had a car with as many design and assembly faults and errors I could probably get it replaced under current "Lemon Laws".