I don't remember if the 2005 tow package had a separate trans cooler or if it was just a larger radiator with the larger integrated cooler built in. A receiver hitch was not part of the package at that time. Another thing the tow package had was the auto-leveling rear shocks which I would prefer to not have. This is just my opinion, but you will be OK towing 2500-3000 lb even without the package. You have a 4 speed automatic - just keep it out of overdrive. I have a 2004 Ford Freestar van that would be rated at 3500 with the tow package, but mine does not have it. My popup weighs 3000 lb loaded and I've towed all over the place with it. It is not a safety issue - the vans are rated to tow 3600-3800 with the tow package. Be sure to get trailer brakes and a brake controller - that is an absolute requirement.
