I'm in the process up upgrading my 1998 f-150 xlt 4.6 liter extended cab pickup to tow a trailer. The trailer weight is appox 3700 lbs. The following are the things I want to do. (1) suspension new rancho RS5000 SHOCKS (2) Transmission larger cooler and temp gauge (3) Exhaust after market dual (4) Engine cold air intake,throttle body spacer,hypertech chip. Has anyone done this to their truck and is this enough I like the truck and its paid for. Thanks CARLR