Here we go again, three reply's without the knowledge of how much the truck will settle once the 5er is set on it.
#1 Install the hitch and hook up to see what you really have.
#2 Once hooked up on level ground measure from the ground to rail at the pin location. Take that measurement and add 6' to it for clearance call this measurement1.
#3 Now drop the Landing gear an disconnect from the 5er right there.
#4 Now level the 5er in place, once level measure at the location of the pin, from the ground to the underside of the 5er at the pin.. Call this measurement2.
#5 Now time for math Measurement1-Measurement2=distance to lift 5er at axles to tow level with 6" of clearance at bed rails.
Understand that if you install your old hitch in the new truck, as it came out of the old, and the distance from the bed floor to the rail isn't different between the old and new trucks, you will have the same rail clearance you had on the old truck. The 5er may not be level could be a little nose high, so then we start to deal with that.
