A 5 link setup generally keeps your gas tank stock. No moving it, changing to a fuel cell, etc., which means a LOT when getting it smogged and resale value. 4 links are Next Level, and they can be either a simple setup (underneath the bed, no frame mods), or full kill back half conversions cycling 30" travel. Honestly, 5 link conversions that leave the gas tank untouched are the future. And not specifically for Raptors, but for thousands of F150's. Once you compare the weight and cost of a Deaver set up, plus shackles, straps, bump stop systems, traction bars, bed mounted shocks, etc., versus a modern 5 link, which offers a better ride, adjustable dampening, less axle plunge, zero axle wrap, and equivalent travel; maybe it's time to step up from ancient technology.