Weell ah ... A warranty on mu home is a fraction of what it is on a lot less but not inexpensive Motorhome.
Before...but but bu tgets agoin, Home endures hail, snow which it can't escape, heavy rains, high winds and so on.
if they built an RV to a design, of not having to be brought back unless in a wreck or hit by catastrophe, it would slow down assembly time about 10% and add 5% to materials costs.
Sell a lot more units to repeat Customers and a lot of people would be lined up for used units keeping value high.