I think I may have the only set of Kings on a US Spec 80, and I am VERY happy with them. The ride is firm, but very controlled and no harshness. I am running them with TJM Progressive springs and 30mm MAF spacers. Be advised that the spec on the website is incorrect, the lengths listed are too long. These are 10" stroke shocks, not 12". If anyone wants a ride in my truck, they are more than welcome to seek me out and compare it to what they're running.
I applaud SoCal80 for getting a good deal secured, but I would advise against purchasing from anyone other than King and I'll explain why. I ran across a minor issue in that the piggy-back reservoir only fits oriented out toward the tire. On my 4.25" BS wheels with 35x12.5R17 tires, they rubbed under compression/articulation with the wheels turned. I talked to Kellan at King and he said, no problem, come in and lets take a look at it.
I went by yesterday and after evaluating my options I decided it would be easiest to just trim a bit of sheetmetal away from the inside of the fender opening for the shocks and rotating the reservoir to a position aft of the shock body (the spring is in front so that orientation is impossible). Now the reservoir is not sticking as far out as before, but because it is now offset from the steering axis, there is even less clearance once the wheel is turned. We have now determined that the shock setup for a US 80 will have to be remote reservoir. I will be going back to King next week for them to create a bracket and convert my shocks to a remote reservoir setup. All of this is costing me nothing and is an example of King's phenomenal customer service.
I'm not shocked that the 80 application is not completely sorted as nobody has really run them before. I knew going into this that there was every possibility I'd be somewhat of a guinea pig. This real-world data will only help bring forward a better product for all us 80 guys.
All this and King has offered them to us direct at virtually the same price, $1921/set, if we order 5 or more.