There is also a guy using his commercial tractor to pull a gooseneck trailer for recreation. At least I think it's a gooseneck. Search the Escapees for Jeff Bayer or Jeff Beyer? He knows a lot about how you take care of all the legal requirements. I think he treats his recreational trailer as if he's hauling it for work. Keeps his log books going and such. That way he is covered by his insurance as if he's working. I think he found that works better than trying to find coverage for recreational use separate from commercial insurance.
'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio