There isn't any need to run these shocks dual. Some of the higher end trucks run what appear to be duals, but they are really running a single bypass shock, then a separate coil-over spring carrier (looks just like a shock, but has little to no damping characteristics.)
The shocks perform best when they are able to go to full compression (otherwise you may not bottom the shock enough to utilize the bypass). Whatever set-up/travel you go with, make sure you buy the correct length shock. For jumping, the more travel the better, so long as you use all of it. If you just want cool coil-overs or bypasses, King (also Fox and others, I just like the King's the best) offer a full range of sizes to fit any custom application. You'd want to set up your suspension where the absolute bottom of travel is dictated by the bottoming of the airbump, with maybe 1/4" clearance from bottoming the shock. You'd also want to run limiting straps to avoid over-extending the shocks.
The bypass shocks are position sensitive, meaning that as the shock is compressed, the damping rate increases. (The small tubes on the outside of the shock are the bypasses, fluid runs around the bypass until the piston passes the bypass tube, then all fluid is directed through the piston.) The shocks I purchased (2.5" Prerunner, 2-bypass) essentially give you 2 compression damping rates and 2 rebound damping rates, all tunable, combining this with the airbumps (also tunable) allows for a 3rd compression damping rate to really slow things down smoothly. By changing the shims in the shocks and the nitrogen pressure in the airbumps you can dial these in perfect.
The coil-overs on the Green Bronco are dual spring-rate, but are speed sensitive with respect to damping. i.e. if the tire is moving upwards quickly, the shock becomes very stiff, if the vertical movement is slower, the damping rate is lower. That truck also has the airbumps. By eliminating the leaves/coils of the stock set-up & 4-linking, he was able to get greater total wheel travel with similar size shocks.
If you want to jump your truck and not break parts, I highly recommend either of these set-ups (in my opinion, the airbumps are also a must-have, if you're already spending $2000 on shocks, what's another $800 in the pot
If you've got the ca$h, go 4-link. Your truck will hook up better. Zero axle wrap, zero bind.
It's going to be very interesting to compare the suspension performance of these (2) very different trucks. Just wish I had the cash to go nutz on the motor like Sean.
The motor will be a slightly built 302, Forged pistons, Victor Jr. Intake...shooting for 325-350 hp out of the motor, then I'll add a 100-150 hp shot of Nitrous for dune shenanigans...
I've got most everything purchased for the motor already except for the cam, lifters, pistons and NO2. The Nitrous will probably be a couple of years, easy enough to add it on. That $3500 has to get me fuel lines, brake lines, 4.56 D44 Ring/Pinion, rebuild on 9", paint, etc., etc., etc.....%)
