These things are only as good as their mounting in the truck. I has one that I mounted in an old ranger and I must have done a good job because I moved a 12(?) inch x 48" Southbend twice with the cast iron base. The jack was handy because the bed was too heave to lift with the winch. Mine was the tall one.
I kept the crane when I sold the Ranger and put it in an F150. That didn't work out so well , there is a lot of sheet metal back there and I didn't secure it as well as I should have.
So yes they are very good but need to be anchored well.