Hello, I just installed a x9310bt in my 2006 duperduty using the metra 70-1771.
http://www.sonicelectronix.com/item_44756_Crimestopper-SV-6819EM.html
I ordered this cam to keep the install as low profile as possible. Figure a thief is gonna notice any vehicle with a licence plate cam and target it as aftermarket. I think it's best value for money because you can point it after the install. I like the retail packaging and included accessories.
Highly recommend the parking brake bypass as well as a switchable speed pulse wire.
Good Luck!