I've got the same type of eyebolts installed in my camper shell. And a pulley system with a worm-drive hand cranked winch in my pole barn, along with a rack to hold the shell when I remove it off the truck. So to remove or install the shell now takes only about 15 minutes. The rack holds the shell up high enough so all I need to do is back the truck under the shell, then drop the shell a couple inches onto the truck bed. The worm drive winch is handy because it cranks easily and holds the load in place without extra steps needed to lock it in place.