I'd give up on AEV's glorified spacer lift. There are may other options for suspension for your gen truck than there are for the long arm trucks.
BUT, there is no easy way to fit 40s under a 4 link 4th gen. (like there is with the AEV kit for the radius arm Rams, which moves the front axle forward 1.5") I want to move my front axle of my 2012 forward so badly I can't stand it!!!! Even just keeping my 37s, I'd still like to move it forward as the axle looks much too far back in the wheelwell to me. (and I would like to eventually move to 40s) Also, moving the axle forward would allow me to fit some wheels with less backspacing so I can get my tires off my control arms WITHOUT having to worry about trimming the back of the wheelwells. (there are several large electrical connectors right behind the inner liner of the driver's front tire which i doubt would allow for much clearance gained there without cutting the footwell floorboard to recess the connectors into it) With the AEV kit, this movement of the axle is cheap and easy (comparatively) for the 2014+ vs trying to do so in an earlier 4th gen (like my 2012) is a pricey custom job. I have a full Carli suspension, their older version of the 2.5 Performance (not the new long armed one):
3" lift
2.5" remote reservoir stainless shafted King shocks
Fabbed towers
MIG/mild control arms
Now a new style trackbar (just freshly upgraded it!)
Full replacement rear leaves (their standard pack)
Thuren rear shackles
The only thing I really don't like is that I wish the front axle was pushed forward. (preferably 1.5" then, AEV's flares would be an option! (though honestly, I'd probably just sawzall my fenders, trails around here are a bit tight for my truck as it is without big flares, and I am a cheapskate, LOL!))