Every manufacturer sets their vehicles towing capacity which can have several different ratings with a single model depending on engine size, transmission, spring capacity to mention some of the components that can change its tow capacity. Example: A 2013 Ford F150 can have between 5,500 Lbs to 11,000 Lbs tow capacity depending on its configuration. While there are many moving parts to the towing equation, most modern ½ ton pick-ups will tow the heavier Oliver Elite II. The GVWR (Gross Vehicle Weight Rating) is 7,000 lbs. The GVWR on the lighter Elite I model is 5,000 lbs. As long as your tow limit (lbs.) is equal to or higher than the GVWR on either model you are safe.