Here's a simple mod that I did to my 5er to make it easier to set the pin height when hitching up to the truck. I assume it would work with a goose-neck also, but I don't have experience with them.
http://www.klenger.net/arctic-fox/brake-away-switch-cable/index.html
http://www.klenger.net/arctic-fox/brake-away-switch-cable/index.html