My 32' is 12 feet wide - the widest point is forward at about the forward edge of the cabin. The transom is less, do not use that as a guide.
My 28' was, as close as I could tell, a shade under 10' and I used to take it on the road without wide load permits, but there are still restrictions on where you can go. There is a website that give all that info for Florida, and you can probably find a website for other states.
The 28' is absolutely the largest boat that I would take on the highway, and even with my diesel Dodge Ram 250 it was not an easy tow. I gave up on the idea of dragging it to different places on weekends, it was just too much. On the other hand, the 28' is as nice a boat as I have ever seen, and with a single diesel is a perfect cruiser. The hull is very easily driven. I have often wondered whether moving up to a 32' twin was truly a good idea, what with marina fees and all the other added expense. All I get for the money is 1) better slow-speed maneuvering (the 28' was a dog), 2) a saloon to sit in when the weather is bad, and 3) a flybridge.
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida