If the skid does not have the aluminum rebuildable shocks in it... dont waste your time.
You can do it with some, I believe, 7/16 thick by 1" dia aluminum spacers with 3/8" holes thru the center. No need to buy longer shafts.... but you would need to use some very high quality bolts that are 1/2" longer for the mounting in the tunnel.
The valving would need to be changed, which is pretty easy...Carls could get you dialed in then you have the shock service checked off the list as well.
As as side note... the rails are able to be swapped to the edge if you want to. The mounting holes are the same... the cross bolts on the rear lower scissor are bigger on the IQ rails.. so you would need to put a bushing in that location or run IQ cross shaft there.
Good luck