I bought a 4dr 4500 Dodge cab and Chasis. My plan is for this truck to be VERY versitile. I put a 9 1/2 foot dumping flatbed on it with recessed stake pockets. The removable dovetail was an after thought. I have a dedicated maintenance truck with a dovetail and I have access to several dedicated dump trucks of varying sizes and I have a dump trailer. I needed something with a little more rear end than my 2500 to pull my big equipment trailer, but I wanted the capability of putting a leaf box on it or whatever else I may need it for.
We toyed with several different lengths for the dovetail. I hate to say it, but I haven't even seen it since the production of the dovetail started so I don't know the exact dimensions yet. Spann Metal in Lenior NC (4 hours away) is doing the fab work. They have done a few that I have seen pictures of ... SOOO - we will see Saturday.