Today I installed the hitch in the truck and hooked up to the 5er. I took measurements of the whole setup. It appears I have been more concerned than necessary. Measurements showed loaded clearance right at 6 inchs at the bed rails, 7" out of level, (4 degrees). front is 34-1/2" and rear is 27-1/2". That is measured from the moulding strip that runs the length of the rv. Truck squats 1-3/4". I don't know why the measurements from last year were so far off. I will remeasure on our first trip this spring, after everything settles in a bit. I will plan on tire upgrade this fall to Load range D just in case the rear axle has a little more weight on it.
Thanks all for the great info, I learned a lot. HAPPY RV'ING