Turns out there is a company that sells the adaptors that will convert the front from single to dual wheels.
Still, I don't understand why you couldn't just exchange the studs for longer one. I would turn the front wheels around and check the clearance turning lock to lock. With the six inch lift, you may be OK, or you may need to modify the fenders if there is not enough clearance. I would definitely put in the Danatrack units.
The steering components will not be able to turn the wheels very well, especially on pavement. It will be an off-road only vehicle. Do not take it onto the road.
2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.
2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.