why hasn't anyone suggested the cheapest mod of all for rough roads, drop tyre pressure to 26-28psi. use the side wall to complement the coil and shock.

IME the off the shelf lift kits use a firmer rate coil to achieve lift. the manufacturers do that so the coil free length suit factory shocks. for rough roads i'd opt for a softer coil with a shock with adjustable compression and rebound to fine tune.

if you don't need the lift, leave it as is. too many people fit lifted coils because their mate did. i was and still am guilty of that, but my truck is well past normal. Qualifies me to preach with an empty wallet and wisdom of hindsight.