Really like the hangers I got on Ebay. Picked these because the hanger had a deeper measurement compared to others.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F183624505831
That was my biggest concern before getting the kit. The extensions should do a good job and I don’t have any hesitation using them on just a 1.5” level. I’d be “shocked” if they ever failed (sorry had to do it).
I used Voodoo Fab universal cross bars to mount a box for our skis. Mounts under the Truxedo tonneau rails. Works great for my needs. Not sure if I’ll do this with the gladiator or mount the box over the cab.
http://www.kbvoodoo.com/shop/universal-crossbars-for-tonneau-covers