Proper 5th Wheel Hitch Position

I just purchased a 2017 F250 Lariat Diesel, measuring from where the back wheel hits the ground to the top of the bed rail is 57", my previous truck (2005 GMC 2500HD diesel) measured just over 54". The new truck sits 2" higher in the back compared to the front. My new truck has 18" tires but some come with 20" and that contributes to the height along with options on the truck. My hope is the truck will squat at least 2" in the rear with trailer then with air bags get it sitting close to level. From my measurements I hope to have around 6 inch clearance from truck bed to Fifth wheel, keeping in mind weight limits of the axles and tires along with payload. So with trailer hitched up squatting at least 2" to around 55" and the leveled front fifth wheel height of 61" hope to have 6" clearance. Have not adjusted the height of the fifth wheel hitch from when it was installed in old truck.