Pricing from OffroadWarehouse.com right now starts @ $2073.00 w/5" rear spring you will add everything else to that. You will need to compare how they are lifting the rear. They are offering free shipping until 7/31. I believe that the Dreaver spring that Donahoe has spec'd rides better and it is designed for the diesel version only. All other engine combos just get a higher lift, they offer no other spring. If you're not sure about something you can always call Donahoe. I did a couple times when I had questions before I bought mine.
I have not run the single steering stabilizer, none offered by Donahoe. So, I'm not a good source of info on single versus double.
Compare the actual weight rating of the tires in pounds, not the letter rating. You might be surprised at what you see.
Tires in these sizes vary greatly.
Also, do not forget the adjustable track bar(pan hard bar) and the front driveshaft with need to be replaced or at least the stock one lengthened. The steering linkage and the track bar MUST be at the same angle or you WILL have bump steer. The rear driveshaft will have to be shimmed to elimate shimmy usually from a stop, if you have a two piece shaft.
I sure there's something I forgot to mention. But, do more research and ask questions before you buy, it's too late after they have your cash.
And yes you pay to play. These trucks can turn into money pits.
Greg