My P5 has 12" dia by 5" by 2" offset ATP 212 rims and I'm running AMS Slingshot tires in 26" by 11" wide on all corners as I recall I think I'm 53.5" wide. What I do to load in my 96 powerstoke shortbox is I have a sheet of pressure treated 3/4" plywood (4'by8') with tailgate down. At the front (just back of cab), I screwed on a 4" by 4" post across the plywood to prevent the P5 from going through the rear window. Also put some chalks on plywood to hold the ramps under P5 when travelling so they don't fall out on the highway. In terms of wheel wells I stacked a couple pressure treated 2 by 8s a foot long or so and just lay those down beside wells to drive on. I can load without but over time it might dint wells or dig rims pending p5 tire pressure. Installed some D rings at corners of pick up bed and ratchet strap it down. Hook P5 end on (front) Upper A arm (rear) lower A arm run respective strap over top of tire then to D hook on each corner. Ratchet down. By ratcheting to A arms and over top of tire, machine can flex suspension and "move" with truck on rough road, yet the ratchets never fall off. Front tires are chalked against 4 by 4 and I only have maybe 4-5" of clearance at most to rear window, so far fits snug and stays put.
jrc
