If you do not plan on typically hauling a lot of folks don't spend the money for the higher rate springs until you do some testing. It might be like putting a broom stick in place of the shock which you will not like. Have someone help you measure the frame static height and the shock extended spring height, called the preload. Sit in it and measure how much it sags. Adjust the preload to zero it to static height. Then adjust preload to get it to add height where desired. Ride it and see if that is desired or too stiff. If too stiff you can go up in spring rate without the preload adjusted and get a lighter ride. But sometimes it takes just a little incremental rate to find the sweet spot. Do the above and then call Eibach with your spring numbers and ask them there opinion. If they will not help then call one of their dealers and see if you can not get some advice. It may take you more than one set of springs to achieve the height vs the ride quality desired. You will also want to play with the compression and rebound settings on your shocks to get it Tuned to your desires.
08 700 Black Armor SE, resi-shocks, 27" ITP Mudlite XTR, STI single Beadlock 14x7 wheels, JBS 734, Carillo crank & Rod, Viking Cam & inj,MSD, 4pt harn, Viper 4500 winch, Unleashed sheave, JBS 18 gr OD weights & purple spring(greased), Innovate AFR Gauge,Rigid Dually,2 batts with man switch, 6"chopped cage, Mishi rad