When putting coilovers on a rig that was never designed for them, a lot of challenges come up and you gotta have some back knowledge on how suspension works, how to figure spring rate for correct ride height, and lots more. The main ones are spring rate and proper length shock. Yours being a 1500, a lot of people have done it already. You might search around and see what you can find out.
These foxes I had built for my truck. Spec'ed valving, spec'ed shock length, what length hose I wanted for the resi, and different eyelet end as well as a few other things internally. Only thing I wish they had was external rebound adjustment that worked as well as qa1's.