Hey Guys new to this forum and interested to see what every one is using there Expy/Navi's to haul. I have had a 1999 Expedition, but a few months ago traded up to a new/used 2007 Navigator. The travel trailer was a little beyond the towing capacity of the Expy so we upgraded and spoiled ourselves with the new Navi. Since buying I have added a K&N flat filter (knocked out the tiny snorkel for increased air flow too), Superchips tuner (always running the heavy tow tune best road manners IMO and fuel economy), few other creature comforts and doodads. Future improvement 26-30K tranny cooler to bypass the radiator cooler and run in-line with the factory aux cooler. Please no, that's over your limit responses. I know how to tow, heaviest load 160K lbs. licensed, registered, and very capable. Here is what I run.....