Depends on what kind of trailer it is, and the height of the trailer.
On most of my commercial trailers you would really only need a 3-4" drop to hook to with that size of a truck......and I can still raise the mount on the trailer higher up.
Smaller trailers with a fixed mount you might need a 10" drop.
I run B&W Tow and Stow adjustable hitches on my trucks to make it easy to hook up to pretty much anything with a 2" or 2 5/16" ball mount.
B&W Custom Truck Beds, Inc.
Also, a lot of guys run the aluminum rapid hitches:
RAPID Hitch, Aluminum RAPID Hitch, Aluminum adjustable combo ball mount RAPID Hitches, ALUMIBALL, ALUMIBALL Aluminum Rapid Hitch Combo Ball, Rust-Free and Greaseless - ALUMIBALL is the solution to rust and grease on your trailer ball
And for the guys who really need a lot of drop with added support, we sell these:
http://www.oneupoffroad.com/ouoparts...pmudflaps.html
