I've been reading a lot in this forum trying to gather as much information as I can. From my understanding the the 2003 and early 04 GX470, has a different towing prepped package compared to the other years. What GX470 year will be best at towing? I plan on towing a car on an open trailer. The approximate weight of the car on the trailer will be around 5500lbs. The earlier model GX470 are way cheaper than the later models. Should I look for a GX with the trailer hitch already installed or not? If not, how hard is it to install the trailer hitch on the earlier GX470s?