I had a tongue jack on my car trailer with a plate on the bottom. Trying to hookup to the truck was a pain in the ass because I'd often get the ball about right but a couple inches left or right. So either get in the truck and try again or move the trailer tongue over. The trailer is heavy, especially with a car on it, so I replaced that jack with one that has a wheel on it like yours, only a heaver version. Works great, except cranked all the way up the wheel only has a foot of ground clearance. I'm sure you'll find that wheel very useful.
An alternative to adjusting the mirrors is mount a few rollers on the sides of the fanny, get an American Cowboy hat, and Damn the Torpedos...
