Useful service literature, like wiring and plumbing diagrams with wire/pipe routing information and the locations of access panels for same. Admittedly, some manufacturers are far better in this than others.
In a dream world, I'd like RV body (and window sealing) technology to catch up with automotive technology of the past several decades. How many cars or cargo vans have roofs that leak where they join with the sides, even if they receive no maintenance or caulking there ever? How frequently do class C windshields leak in comparison to class C front cabover windows...and why can Ford et al do what RV builders seemingly cannot?
