Things I need do to my truck to keep it in good towing shape

dodge guy wrote:
Aside from fluid changes, keep up with the basic maint. and make sure you keep the rust from starting!

That right there is your best advice. If you drive on salted roads, the rust is what will destroy the truck long before the engine and other power train parts are spent. A friend with a 2003 F250 with low mileage just told me his truck has severe salt damage.