We went with the Yakima/Thule tracks that use the T nuts/bolts. Low profile, and it works for us. They run nearly the full length of our CCV med top. I have the solar mounted to it as well as the Mega Warrior Basket.
Uni-strut can also be used. More stout, higher profile.
Almost any aluminum track can be used. search Aluminum T track and you will see lots of alternatives.
Is this going on a Pop Top, fixed top? If you are having to accommodate roof curvature the Yakima Thule track may conform better. If flat, then whatever track works for your equipment.
Beastie 3: 2002 7.3 EB Cargo: Agile TTB, CCV Mid Top, Custom Walk Through, Lots of stuff added. BlingMyRig.com