OME dakars and king coils, couple questions

Hey all, just picked up some total chaos uca’s, king coils, king rear shocks and ome hd dakar leafs for my 2011. Couple questions.

Are you guys running 2” or 4” ext brake lines out back ? Also what shims are you guys running? I see some people dont run shims but most have some sort of small vibration. Id rather do shims while im in there swapping leafs than do a carrier bearing drop and it not improve anything. 3° shim sound right for these leafs ?

Am i forgetting anything else before i bang out the lift install? Im doing the cab mount chop and hammering pinch welds this weekend to prep for the install in a week or two. Planning to run 35” km3’s under this thing with a good amount of trimming. Thanks for any advice fellas