Fords altitude towing recomendations
Interesting article about what Ford recommends for towing at altitudes and how they reduce the trucks towing and payload. http://news.pickuptrucks.com/2015/09/should-your-pickup-tow-less-at-altitude....
Forum Discussion
The article states this has been in the manual in prior years. But the article is also confusing because they talk about reducing GVWR but the language only speaks to GCVWR.
