Before I acquired a TV with a backup camera, I sighted center by using the camper cap latch handle and lined it up on the centerline of the AS to aim at the ProPride socket. Dead slow backing, a couple stops and get out and look cycles aid I was usually able to get the stinger aimed right. Then adjust AS jack for height and in it goes with a gentle clunk. Latch and go from there.
Yes, it was a lot easier with a spotter standing clear on one side for safety. IMHO it's too dangerous to stand in harms way where I'm backing a big truck into a small target. Still got out to see 'ground truth' when close.
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'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it