Forgive me, whats an RR?
If you really want to do LT later on, why not just go King adjs? Buy once, cry once. Along the way you'll probably put 33s on and such so having that adjustability is a lot better imo.
Also, realistically think about this. Are you the type to mod your vehicles? As you know plans change as time goes on. If you really are going LT, plan it all out now. If not, save yourself some cash and go with the dobs or billy as others have suggested. If you really use the truck offroad, go with King or Fox. Try to take a few trips that you like to do. (ie: desert running, or technical stuff) then buy your suspension as you see fit. Choose a few systems (higher end and mid grade) and really do research. Write down pros and cons and choose form there, this forum is a wealth of knowledge so search here. God knows how many threads there are on this topic. A setup for one member might be overkill for you and/or vice versa.
Last thing, if you want that shiny stuff for the road, don't listen to wahoos like me. Do what makes you happy.