Hello Chuck14,
Welcome to Toyota Nation...
I looked at the codes you referenced and those are all Port Installed hitch codes. That code is for the hitch reciever not the Tow Package which is a factory installed option. The codes you saw very by region as Southeast Toyota, the Gulf states, does things differently...
Unlike older GM's Toyota does not have a label in the glove box or spare tire cover with the options codes. Even if it did the Port or Dealer Installed options would not be shown. Other than a quick glance at the transmission oil cooler the most accurate test is to have a Toyota dealer run the VIN and pull up the vehicle to see what options are installed.... My Towing Package is Code TO on the Window Sticker.
Also keep in mind the HiHy has a lower tow rating then the standard gas Highlander. I believe it is 3300 pounds for the HiHy versus 5000 pounds for the 3.5L gas...
There are several towing threads I suggest you look in the "sticky" section as well as doing a search...
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Wayne
2008 2WD Limited Blizzard Pearl, Towing Package / Hitch
Mods: Formula 1 Ceramic Window Tint, SportWing Bodyside Moulding, SmittyBuilt Hitch Step, SilverStar Ultras, AVS Bug Shield, Wong's Neoprene Inserts, MGT V-1 Mirror Mount, JDM Horns, Toyo P245/55R19 Open Country H/T
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