I've loaded/unloaded my current FWC and my older FWC about 20 times. What I find works for me is to get the truck all the way backed in (after stopping and checking alignment a couple times while I'm backing up). Then, with the camper lightly touching the front of the bed, i have my wife (she's strong, but only 105 lbs) push on whatever side is to close to the bed. She just kind of leans on it with her body weight as I lower the camper onto the bed. If it's not quite straight, I raise it 1/2" or so and do the same thing til we get it centered. My FWC only has about 1/2" clearance at each side of the tailgate, so it's a pretty close fit to begin with.