Has anybody installed one? Did you use their battery box? It said you may have to "bungee cord" it or make your own brackets. Doesn't sound like a secure mount. http://www.performancedistributors.com/batteries.htm
If this link doesn't work, try sending XSTANG a PM or e-mail. He was the one planning on installing one. (I came up with this search result using just "weight" in thread titles in the '03 forum.)