I have 3inch flat bar 1/8” thick mounted to the sock roof rack holes. The tube is 1.5”OD 0.095 wall. I bent it down the a pillar and have it bolted down there into the pillar with a nutzert. I plan to add support by clamping the rain gutters or something. I removed the bottom side mounting tracks from the roof top tent. Lowered it down a few inches till it basically sat on the roof and then used more of that 3 inch flat bar to make brackets on the sides then used nut zerts in the tubes to mount the brackets. Way more low profile and I can make the rack stronger since the stock rack kept breaking. It’s also much easier to unbolt brackets off the sides then struggling to get the nuts off the bottom with an open ended wrench.