The link doesn’t work, so I have no idea what we are looking at.
I do know a top end suspension from me would run you in the 7k range. But that’s 14” coil overs front and rear, air bumps, anti rock rear swaybar, swaylock front swaybar, custom 4 link rear, custom 3 link front, Johnny joints all the way around. But that’s as good as it gets.
Otherwise, off the shelf, you can easily spend 7k on fabtech coilover kits by the time you option them up a bit.
Or what joel said, air rock with pretty near any longarm.
My rims and tires were 4500. Closer to 6k if I hadn’t of gotten the toyo’s at cost. But that’s 5 beadlocked 38’s.