Yes, they are very useful. BUT you've got to go to the trouble of cutting a hole in the truck bed and make a mount that fastens to the frame. I tried using mine mounted to the stock truck bed. NO GOOD. Then I used some 2.5" square tubing fastened to the truck frame. Then I used some 2" square tubing and a plate to make a mounting for the crane base. A couple of holes in the 2" gives me some adjustment for height. By using a block and tackle or else a winch you can make them a little easier to use to get over their limited range of lift.