I have a 3/4 tone Chevy 2003 with 105,000 miles. Everyday hooked to a 32ft gooseneck trailer. Some times haul block in back of truck or whatever works when not hooked to trailer. Well, things are getting a little saggy and when a trailer is on now, it really hangs in the rear end. I think it is time to replace something. Both front end and rear I am thinking???? What are your thoughts? It is an job I can tackel? What products would you all recommend? Anything to "beef" things up on the chevy truck - so such as heavier shock? I do all other maintance pretty much but never did this type of work b/f so anything would be helpful.