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I think the first thing you need to do is decide what truck you want to start with. That will drive a lot of the other decision making. For example, 7" of lift on an S-10 chassis requires major surgery to keep driveline and steering angles in a happy range. 7" of lift on a TTB Ford is easy. But having adjustable ride height on that TTB suspension will be nearly impossible due to major camber changes throughout the travel.
Swaybar disconnects are not a necessity when adjusting ride height. But man can they make the ride off road better, and typically increase vehicle capability by allowing much more flex.
In the end, I do not see the feasibility of this. 14" of adjust ability is massive. And 3 different sets of tires? Where's the economy in any of this?
I am a fan of picking a tire size, then keeping the vehicle as low as possible to fit them. If you put 35" tires under a truck, your axle/differential clearance is now set. Raise or lower to your hearts content, it won't change that dimension. Now, lifting will increase approach/departure/breakover angle clearance.
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