If you had a 2wd I would say that's not expensive this is http://www.bulletproofsuspension.net/FORD/97-03-F150-12-in.html
Nah...too much of a pain in the ass. Don't know what parts I need, how to get them, and going to be expensive. Plus it won't help to keep it from sagging with the trailer. If I want it even higher I'll just get bigger blocks but for now I don't feel like taking out those hangers and crap so this is the easier/ cheaper choice.