Have you checked out the HDT section of the Escapees forum? HDT - Escapees Discussion Forum
There are lots of people using hdt's to pull their 5th wheel campers there. First thread to read should be this one: The Heavy Haulers Resource Guide & HDT Rally Site - Escapees Discussion Forum
That's the resource guide. I bet you might find your license question answered there. I think there is a state by state listing.
Good luck. Sounds like a cool idea.
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'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
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