I am going to buy a trailer hitch ball mount and don't know what size drop I should buy. I have 2010 Tundra doublecab 4X4. I don't think it is really any higher from the ground than other models of Tundra, but these trucks are big. I am planning to pull an ATV trailer which I haven't bought yet and was wondering one with just 2" drop would do or I need to get one with higher drop. thanks for your help.