It's the off the truck part I'm concerned about. The axle will just rotate around sitting on jack stands.
You're gonna have to get creative about holding it, that's all..
Just off hand, I think I'd try laying a 2x8 on one end of the axle, and drive your car up onto it. I dunno - maybe easier said than done but its an idea.
Or - I've seen pics of guys that strap them down to a tree to hold it still.
OH.. And you might want to have a look at this post -- http://coloradok5.com/forums/showthread.php?t=286143&highlight=kingpin+removal&page=2
I got my VERY stubborn KP removed by using the technique Pumpkinator used. My axle was just sitting on the shop floor, no hold downs or anything. One of the photos shows a tool I made out of nuts and a large bolt. Just welded them together and then you have something to stick the socket onto.


when I was reefing on it trying to get them pins loose... Talk about feelin like an ijiot! 

