I have a Amerideck loading system with the Choremaster body on it. I was going to use it for my motorcycle, plans changed. The Choremaster box I believe is about $900 more than the flat deck. The advantage to the deck over the box is getting 2 bikes on. With the box you have more flexibility but only one bike.

http://www.powerdecks.com/category_d...guid=Landscape

$1800