Shouldn't be too hard to frame something up for that weight. Most of the HDT (Heavy Duty Truck) guys (see HDT Rally for some more info on them) move their 5th wheel hitch rearward of the rear axle. And I think most of the larger 5th wheel campers run about 5k lbs pin weight.
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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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