Saw this today on KSL classifieds under engine/parts. It's been up for bout a month so you could probably get em cheap. All you'd need is a lock off and throttle plate (if you don't have the stock one already).
It has been on the truck for 2 years and has been to little Moab 2 or 3 times and 2 Moab trips. It is a gotpropane.com kit and comes with 1 tank bracket but no tank. If I remember the kit was about $800 I was going to put the drive train out of this truck into Steve's old 81 Toyota but that truck was burned in a fire this summer so I'm parting the truck out.