I have watched another company in town that have them and I don't think it's worth it nor could I ever justify it for me. Especially if you don't have the extra cans/bodies for it. I'm not saying they are bad but just don't see how it would help how I do things. The contractor box can carry pallets or bulk materials and then pull the skid or mini on the trailer, the trailer is also not a problem here. As for landscape rock, I run that thru the rocks door. I talked with my upfitter at length on the hooks and in a 550 size truck especially the extra weight and load height(and lets be honest extra money) take away the positives. To me when it comes down to moving material you can not beat a regular dump truck for that.