Coilover for nbs?

[theangrynortherne]

So I was looking around Facebook marketplace and saw a 2005 yahoe for sale in Texas that had a viking coilover suspension on it. I have been looking hi and low for something better then the bilstein 4600 I currently have but not air ride I don't want to replace air ride every 5 years. My wife's acadia denali has a coilover that I just replaced and it seems to be a way stiffer ride then my 05 yukon xl denali. Has anyone had any experience with viking? They seem relatively new. Any suggestions? At this point I'll try anything please and thank you fellas

Also I plan on lowering my truck with the 2/4 kit from normal ss not sure if that'll make a difference