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I also have a Grand Design Solitude 310gk. But I have 7"inches of clearance from the overhang to the bed rails of my 2012 Ram 3500 srw. The rear of the 5th wheel is a little to low so if I raise the pinbox to the next setting there will only be 5" of bed rail clearance but the rear should come up. Unfortunately the pinbox adjustments are 2" up or down so I will leave it as is and order the 2" lift blocks and U-bolts kit from one of the suppliers mentioned above. If you decide to install the lift blocks, find a level area to do the work. Also you don't need to remove the tires to do the install, keep them on for safety and use your hydraulic jacks to raise one side at a time to put the lift blocks in. A 3/4" deep reach 1/2" drive ratchet and a torque wrench to final tightening of 70 to 90 pounds for 1/2" u-bolts. Good luck.
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