I also use the Rickfox method for hitching.
I've tried the string and other methods with not a great amount of success. It works on a hard surface but is less precise on gravel. My Dad came up with a unique method about 10 years ago and we've had great success with this. It's a simple bubble level mounted in the basement area. It's on an arm with a thumbscrew to tighten it down. When we've raised the Montana to where I'm ready to pull out from under, Vicki loosens the thumbscrew, centers the bubble, tightens the thumbscrew, then levels the rig. When ready to hitch up, I raise/lower the rig until that bubble is again centered and I am able to hitch up first try every time. Works great.
Dave (M.S.) do you have any problem with wd-40 collecting dirt and maybe grinding on the metal?
This one is old and ugly but it works...