2 years ago, when we took our garden wagon to the Grand Design Rally, I had to make a rack that would fit over the tonneau cover, with this I was able to take the wagon without stuffing it into the trailer. There was no room in the back of the pickup under the tonneau cover. I didn't think I would need the rack again so I used the wood for some other projects. I have the same issue this year except it's 2 wagons. I used the same basic design; I even had the same metal brackets I used 2 years ago. I used some 2x2's and 2x3's and some cheap fence board to make the rack. I made a story board to make sure the wagon tires will fit. The only issue I see at this time is getting the wagons up on the rack, each is fairly heavy. I had to make wings on the back of the rack for the low-rider wagon, the rear track is about 4 inches wider than the front track. If this doesn't work, my other option will be to remove the tonneau cover and load everything on top of the wagons in the back of the truck.