It's the Dodge WC-56/57 US Staff Car. Skybow made one over 10 years ago that is an excellent kit and now released by AFV Club: www.squadron.com/ItemDetails.asp
The Italeri Dodge Staff Car is the ancient Peerless Max kit from the 1970s. A decent kit for its time, it is now 40+ years old and obsolete compared to the decade old Skybow/AFV kit.
Blast Models makes the canvas cover for it, I don't think the Skybow/AFV kit comes with the canvas cover: