I remember buying one of very few new vehicles I ever bought. It was I think one of the most basic F100's out there I think about 1980. What ever time it was, that year and several years around that time frame they had a 12 month -12,000 mile warranty. I had one major issue right in front of a Ford dealer with the clutch just about 100 miles before the warranty ran out. They fixed it and had no more issues for over 100,000 miles when I sold it for a heavier truck.
How much warranty does a new sticks and bricks have. What if your builder ends up declaring bancrupty after you take possession? I think that has happened with a good number of rv mfg. over the years. But I do think there should be a better warranty rv's and a good number of other items.