I use foam blocks with my kayak. Although mostly only use them on my TV. I also don't know how they would work with the truck back you have. But it works with the pup it should work on your truck. I did put the kayak on the popup once, but the on/off was a royal pain. The blocks have come in real handy, but can wear out in time. Not sure how well the canoe blocks are especially if you are doing a lot of dragging to get the canoe in position on the vehical. My kayak is 15' and 50 pounds. The only way I can manage the weight myself above my head is take it in half which means it can drag a lot. My blocks were in rough shape the first year until I built up some muscles and learned ways and created a PVC pipe tool to roll the kayak up and over into position on the vehical. That managed to save the lives of the blocks by a lot. Just something else to think about. Have fun. My little side kick loves to get out on the lake with me on her kid size kayak, although she much prefers to soak me or kayak to private coves to swim vrs kayak. Oh well she's having fun and gets her out.