We stayed at an RV campground outside of Washington DC some years ago where I spotted a Class A diesel pusher (one of those giant bus-like motorhomes like rock bands take on tour) that had a Tahe Greenland sea kayak and a 16’ fishing SOT on the roof (and he was towing a BMW sedan). Turned out the guy who owned the motorhome was a traveling construction engineer who lived aboard the thing while working on projects around the country. Neither boat looked used, so I wondered if it was just a status thing. He was very pleased when I recognized the Tahe but admitted he had yet to take it out anywhere.
Folding kayaks are a pretty good option for hauling in motorhomes. Or this (which was my rig until I sold the RV a few weeks ago, still have the long tongue trailer.)