The truck that tows a TT or 5er, normally pulls double duty. Not only towing the trailer, but also for many other things. Sometimes it's a daily driver. When we had our truck and TT, the truck had 25,000 miles on in after less than 3 years of owning it. It wasn't a daily driver, but was driven often enough. Motorhomes are normally the opposite. However, many are driven daily. People do live in them. Our current MH which is almost 2 years old, has only about 5000 miles on it. We will probably add about 3000 miles or so this year on our trips. That is for a 2 week trip and some weekend camping here and there as we both work full time and have a kid in school.