There's loads of tutorials on how to make a 'lift' from changing links, however that's just a sensor trick where the level / height sensor will compensate and raise the truck, stiffening ride, shortening travel etc. At the least, a set of tophat spacers and then links (Plastic or metal) are fine to return the shock stroke to oem tolerances, keeping ride smooth
as for spacers, it's a hot topic. some call it the 'wheel delete kit' because poor maintenance of spacers can cause U.S.S (unintended separation at speed)... spacers well maintained, torqued and looked after are fine assuming you're not also pushing the limits of load, towing , cornering, etc. I've calculated it mathematically (it's my background) and there's a thread here somewhere where I posted some quck math on the added load on the hub. It's personal pref (and budget) to use spacers over a proper offset wheel .