I have the Yakima Jetstream cross bars mounted on a Pace Edwards Ultragroove tonneaus cover for my truckbed. I created a ‘hack’ to utilize the Trxstle CRC v3.0-adjustable (11’6”) rod carry to pass through my rear window opening utilizing a Minicell closed cell foam block. The foam block supports some of the length of the the carrier and plugs up most of the space between the carrier and the window opening reducing wind/road noise. I cut the block to slide into the rear window opening and then cut an opening in the foam block for the rod tubes to slide freely through. I prefer to have my system break down quickly and store as I prefer not to have it attached long term. For my setup, the CRC T-slot mounts are a big improvement over the clamp design for me and look a little ‘cleaner’. The only draw back is that they only fit on one side of my Jetstream bars due to the limited length of the mounts. I wish the bracket arm that holds the locking mechanism was longer so it was a little easier to access my hand to them as well as to be able to mount on either side of the bar. As it stands, the hand turning lock sits right up against the crossbar with sufficient but little room to negotiate. Overall, it is a good improvement over the clamp design, works very well and it was worth the price for me.