I'm in the process of building a '75 Chevy K10. This will be strictly an off road truck used for trail rides, some rock crawling, and occasional mudding. I'm running 33x12.50 tires and want a 4" suspension lift. I plan on doing a shackle flip in the rear and new springs in the front. I've pretty much narrowed my choices for the front to either the Tuff Country EZ ride HD or the Skyjacker Softride. I have a heavy winch mounted on the front bumper so that's why I'm looking at the HD version of the EZ Ride. I want something that will ride decent, have good flex, is strong and durable, and won't start to sag after a few years. Out of these two choices which would you guys recommend?