A buddy of mine has the same problem with his SB Ford. All he did was painted a small stripe on the toolbox so he could line up the hitch each time by looking in the mirror. Once he sees the height is correct, he watches the rear view and lines up the stripe with the pin and backs right under it.
2012 Sandpiper 365SAQ weighing @ 15k, Onan, 2nd air, slide toppers, TST
2013 F350 6.7L Lariat 4x4 CC DRW,Viair 1007, Ride-Rites, Edge CTS, B&W
2001 Chevy 3500CC DRW 4x4, 8.1L, 4.10 gears w/ Detroit TrueTrac
2001 Ford Excursion Limited 4x4 7.3L,V/B Spring Mod, ProComps, Hellwig Swaybar, & other 'Necessities'