Since he never replied I'd agree with the above, that he got scared out of it.
I looked into it years ago, potentially hauling other people's RVs after staying at several campgrounds and watching one truck pull in 2-5 different campers. He was a member of that family but I started to notice a LOT of people have an RV but no tow vehicle. So I started a mobile RV repair, bought a couple campers I could rent out, and looked at pulling others.
After talking to our local weigh master and reading through the laws, there's a LOT that most people don't know. By pulling someone else's RV, you need commercial insurance, DOT numbers, you now fall under ALL DOT regulations (meaning truck inspections, drivers need medical cards, EVERYTHING), and just...so much else. It ended up not being worth it for us so we dropped that part of the business. Hauling our own rental RVs for the business, however, since we weren't carrying a customer's property, meant we essentially were treated like a lawn care company - we didn't fall under DOT regs. Still needed the commercial insurance though. At least in my state.
It's a hard market to get into, hauling things for others, and there's a LOT of things to consider. Overall I'd say it isn't worth it for most people.