Hello All, I have a stock '86 K5 that I use to tow my boat (5600 lb) with. I would like to add a 2-2.5" lift, but don't want to loose the nice factory ride. Is there any problem in towing such a heavy load (400 lb. t/w) with the stock springs and a shackle flip, or should I just add blocks in the rear? Thanks! "Like a Rock"