Breaker bar and a pipe. I ended up using a four foot pipe on a standard 24" 1/2" drive breaker bar.
Bought a T-55 impact socket at Napa for about 6 bucks and used that. Once the bolts were freed up a bit, the IR 2135 did the rest of the work. Some actually came out intact.
For new clips, Ford dealer. New bed bolts, Fastenal. Got all of the hardware needed for about 55 bucks rather than 120+. I think I replaced two clips, reused the others... all of the bolts were replaced with 8.8 metric hex bolts with the proper thread and a little more length for using the clips. Also had to get some large fender washers... thick ones.
Anti seized the hell out of the bolts so future removal, if needed, will be much easier as well as keep rust from forming on the part of the bolt between the bed and frame. (important in the rust belt)
Lots of CRC Freeze-Off was used beforehand for a couple of days.
1996 Ranger 3.0, 5 speed stick, 4x4, 3.73's, 31" BFG AT KO's
Wiring, it's all fun and games until you poke yer eye out with a soldering iron...