We live in Arkansas and do it all the time. I pull my boat/kayak trailer behind my Jeep which is pulled with the MH. I have been told by the state troopers that it is OK. If you look at the federal regulation for double trailers, there is not an overall length limit. It only says that each trailer can be no longer than 28 1/2 foot. So I guess if you were pulling a trailer longer than that you would be in violation. But, this is federal law for commercial motor vehicles so who knows on an RV. I even see bumper hitch travel trailers pulling small boats and golf carts in trailers. I have never seen or heard of anyone getting stopped around here. We were in Branson, MO and there were over 20 rigs at the WalMart, all fifth wheels pulling big bass boats there for a tournament.
But, I do know this for a fact. My uncle lived in Phoenix, AZ and had a fifth wheel and a bass boat that he pulled all over the country and even into Mexico. He was stopped in AZ by a federal DOT officer and had to drop his boat, go drop his trailer and come back and get his boat. After doing some research he re-tagged his one ton truck as a commercial truck/tractor (he is a retired truck driver with a CDL and a doubles/triples endorsement). He was then stopped by the same officer at the same location again only this time the officer let him go and told him all was good.
So my answer would be to give it try but be prepared to get stopped. If it is illegal then everyone else doing it does not make it right.
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