I am looking at purchasing a used PPE standard tuner. What results can I expect to see from my 2005 LLY. It is bone stock except for a AFE mouthpiece. Stock exhaust, standard size wheels. and all amsoil fluids (engine, trans, rearend, transfer case.) Almost every weekend in the summer I tow either my 28' enclosed car trailer with 2200lb roadster and a golf cart in it or a 28' travel trailer camper. What setting can I safely tow with. I always tow at around 60 mph and rarely beat on the thing. Also, I am picking it up in person what should I look for? How would I tell if its locked?