Success! All bolted in place and hooked up. I didn't have to build up any extra reinforcement behind the bulkhead.
Went fer a quick run and then checked all my connections. No adjustments or tightening required. Whew!
Small bumps are definitely dampened. The bigger bumps don't feel like they are dampened enough. At least I know it works well enough to move on to the next step.
Time to hunt down some air shocks fer a decent price. I'm looking at the Gabriel Hijacker air shocks model number 49151 for the Toyota Pickup (and fer many other vehicles). Looks like eBay and Amazon has them fer about $70 plus shipping.