Welcome to the forum!
Do you definitely need 6" of lift?
With a Pro-4X you can go the safe route and do a 4" full suspension lift and get plenty of height.
It's better than having to modify a kit that's not made for your truck. I've got the Nisstec 4" lift and I've got pretty much the same height as the 6" Rough Country lift. It's more money but it's made for our trucks. And the components you get are something else plus the kit includes everything: Coilovers, UCA's, rear shocks, shackles, extended brake lines etc. I did tons of research and in the end, it was worth the cost for me. Just depends on your budget!
You can check out my build page if you'd like:
Hey everyone, time for me to make my own build thread since I'm modifying my Frontier! I've got the '22 Pro-4X in Deep Blue Pearl! Right now the only thing I've done is put tints on the driver & passenger windows, bought a Heatshield for the front windshield, added the Access original roll-up...