Solid solution that works with the slimline 2 rack
"Does what it says on the can really and great quality as you’d expect from Frontrunner. Works with the slimline 2 internal Support and they provide longer bolts to accommodate both. Only issue I had was the instructions advised to fit the side roll bar mount brackets onto the shelf first. It doesn’t fit if you already have the rack installed so add these last if you have the roof rack already installed."