Really an excellent set of posts. I don't think any of the posts are off base or ill advised.
I was looking at three new RV's last Friday and just looking at how the mirrors were installed, the type of sliding bedroom hinges used and their smoothness, and tapping on the insides of the cabinetry and looking their hinges as well, I saw three levels of quality in the construction and I knew that one was probably best used for three days to a couple of weeks, the mid range the same, and only one, and without reading the fine print, seemed up to the task of a full-time vehicle, and I would guess what I can't see follows the same quality design or lack thereof.
All the same size, but a big difference in price.
The question is how much do you know and what can your eyes see based on your level of knowledge, and yeah, I would buy used and will buy used shortly, but I will have to do a lot of due diligence and have to pay professionals to dig deeper than I'm able to do and if it won't qualify for an extended warranty...that's an issue of how much risk I'm willing to take and luck that nothing significant was missed.
My friend was cleared to ride his bike by the doc and he died not that long after during an extended bike ride - just had a heart attack and fell off the bike - dead when he hit the ground. Can't nail it all down, but you can minimize the amount of significant unknowns.