He thinks 14', looks about right from the pictures.
All the paperwork is in check. In Ohio don't actually need title for boat and trailer. Just registration for the boat which he has. Sign the back to make the transfer.
On an old trailer I bought the tag was really bad what I did was to use a very bright led flashlight and a strong magnifying class and looking very closely while changing the angle of the light I was able to read most of the plate.