I may be way off base but I'm not really seeing an enormous departure between Gen1 & Gen2, as far as the shocks are concerned. I mean, at best 500# lighter? On a 6200+lb. truck? And aside from going to an opposed rear configuration, did they really change anything at all out back? Diff, leafs, etc. looks pretty much the same to me. Something is definitely different in the front, given that swapping hats works, could it be just the shock tower (so the 1"-ish travel gain was in up-travel, mitigating CV and other damage from increased droop)? Yes all of the above could and probably should be addressed by revalving (by maybe a shim or two at best), but I'd wager most people could never even tell the difference...
Appreciate the reports uh_oh_6.2, I think I'll stick to rebuilding the stock 2.5 fronts for now but will start looking out for the 3.0 rears used (and cheap lol). Appears to be a viable option with no real drawbacks.