Factory Warranty

I find it strange that an automobile or truck that is driven and used every day comes with at least a 3 year warranty but an rv comes with a 1 year warranty and if purchased in the fall will be out of warranty before any serious usage occurs. Why don't rv manufacturers install hub o meters on a wheel to document miles driven. Then could warranty miles rather than years. Extended warrantys are both expensive and very restrictive about how they are administered. I think the CC dept. of rv mfg. are hoping no one uses the rv purchased until it is out of warranty..