I’ve been loading and unloading my 4WC several times a year for over twenty years, so have gradually picked up some tricks over time. Several are listed in previous posts, but figured I’d list everything that works for me.
I used a yellow paint pen to mark the center of my bed mat, and also the center line on the front ( towards truck) of the camper. This is a great help when backing under it.
Mounted some sections of cheap nylon cutting boards to fill the space between the camper and wheel wells. Mount them with counter sunk screws. They slide easily against the truck, keep things centered and don’t do any damage.
Rather than bump stops at the front of the bed, which are hard to see and just mangle the flimsy Japanese steel of my bed, I mounted a section of angle iron to the bottom of my camper that buts up to the back edge of the truck bed (with some more pieces of cutting board mounted to the angle iron to protect the truck). I then marked where the ends of the angle meet the truck when it’s centered correctly with the paint pen. When the angle is flush and square with the back edge of the bed and between the paint marks I know the camper is perfectly centered, no measurements needed! Also a handy way to verify that the camper has not shifted out on the trail with just a quick glance. When the camper is not installed, the paint marks are covered with the tailgate.
I store the camper in my uneven gravel yard, so when loading I just back under it to within about 6” of all the way in, and don’t worry too much about getting it centered well. I then pull into my nice level garage with its slick cement floor. I straighten the wheels as mentioned in a previous post, then lower the jacks until there is a very slight gap between the camper and bed mat. I put plastic drink cup lids (that come with Big Gulps at the mini mart) between the jack bottoms and the floor to make them slide easier. A few taps on the jacks with a rubber mallet gets the camper centered perfect. Then it’s just a matter of pushing the truck back a few inches until the angle iron hits the bed. No more burning the clutch going back and forth trying to get things centered!
Hope this helps someone, it works for me.
Tom