Hi - I have a 2020 1500 limited with air suspension. I tow a 6500 lb travel trailer loaded. I always tow in Aero mode, Before starting I put the truck suspension on tow haul mode off, In setting up the distribution hitch I first level the travel trailer, I align the height of the trailer hitch with the ball on the truck hitch, do the height measurement on the front and back wheel arches on the truck, connect the TT, add The distribution bars and adjust until my steering wheel height measurements return to original, there is always a drop in the rear of the truck of 1’ to 1.5 inches. As soon as I change the suspension to tow haul mode on the truck levels and I am 0.5 inches lower at the back of the TT than the front……….what am I doing wrong - driving me crazy I like the TT level. Any and all suggestions welcome