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Each tread of the glow step measures 20" wide by 6" deep. In order to properly determine which step is for you, you will need the camper on the truck. You will also need a tape measure. Find a spot below your camper's door that is about 2" tall and 18 inches wide. Measure from this location to the ground on a vertical plane, this will tell you which Glow Step you will need. The 3 step model measures 30", the 4 step model measures 37", the 5 step model measures 43", and the 6 step model measures 49". Whichever is closest to your measurement is the one you want.