Welcome to the best RV forum.
You mentioned over on the dieselstop forum that you have already lowered your kingpin. Can you also adjust the hitch in the truck UP a few sets of bolt holes? Most hitches have adjustment up and down a few bolt holes. Raising your hitch will bring the back down and give you even more bedrail clearence & let you level the trailer.
Robert & Nancy with "Murphy the EOG"
Murphy has passed on, but Micah and Bogie have assumed the watch! 02 Holiday Rambler 5ver, 2015 Indian Chief Vintage. 98 Coachmen truck camper.