To answer one of the OP questions, there are several schools of thought on how to protect the frame. One of the biggest contributing factors is that Jeep did not put any drain holes in the center section of the frame. Most recommend drilling a hole through the existing hole in the lower control arm mount and through the bottom of the frame. The idea is to give the water, salt, dirt, etc. some place to go to get it out of the tubular structure. Once you have a new frame or have capped this one there are, again, several different thoughts. Personally, I am a big fan of Fluid Film. I buy it a gallon at a time (this is enough to do three cars twice in a year's time). I spray my LJ and my crew cab F350 long bed once in the spring and once in the fall. I bought the $40 spray gun and just go to town on it after it has been thoroughly rinsed and allowed to dry for a day. I am also contemplating trying the automotive cavity wax made by 3M. I think it may be similar to Fluid Film, but I am not sure.