A Boss 9'2'' V will work well and will be wide enough if you have duallys. This is my opinion, but the 10' Boss V would work too and be even more productive, but costs around $5K. I think they're well built, have ample reinforcements and trip springs. Don't think you'll have any problems or complaints from either plow. Remember the most important point of all; Boss' website is better looking than Fisher's; that's the most important thing of all. . . . and now the responses from the Fisher crowd.
The 8.5 v works fine on a 350 pick up, i have one. However i agree it is too small on an F 350 Dump. From now on the only dump trucks that get V plows are the F 550, because you can use a 9.5 v. The cost difference between the F 450 and F 550 is so small, your crazy not to get the F 550.
Unless you are buying another truck to run the ezv on, you will lose your shirt selling it, and buying a new boss.
I would add pro wings, or live with it. I have an mvp on a 98 K-3500 dually, extended wheel base with a back pack tool box, and 8' body. I have no problems with the 8.5' width.