I have left eye vision problems so do understand your dilemma.
As far as hook up, I can see our 5ers hitch in the truck's bed as well as the kingpin using the regular windshield mounted mirror. I also have pulled all three of the head restraints for way better unobstructed vision as the back seat of my truck is only used for our two pups - no people.
You could also consider a backup camera plus paint the king pin a bright color, plus add a reflective stripe to help with depth perception. Adding a bed light may help too.
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011 Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014 Montana High Country 343RL (38')