Prepare for disappointment at the scales. You will need the official yellow weight slip from the scale to provide to the Ohio DMV office to register the trailer. Ohio is death on weight enforcement, you might find a certified scale that will let you show them the boat brochure, subtract the listed weight from the gross and the net is your trailer (ignoring soaked foam, battery, fuel in tank, etc.) which would be logical. But every scale I visited refused so I had to pull the boat and return with just the trailer. It is a hefty fine if they get caught using logic for a simple boat trailer hence their wariness.
Next possibility is since the boat is pre- 1980 you will likely need the paperwork from MI and a brochure to obtain from the DNR in Columbus a 12 digit Hull Identification Number, to bring it into current state/federal compliance. They will issue you 2 plates one for the transom and one to hide under the dash at the helm. This is your chance to get the boat id'd correctly especially for length, model number, model name, all spelling etc. on your new title, which you then can take to a BMV office to get a registration. The ladies there are great to work with, were able to add details to both my boat title and outboard title for my inherited '59 Thompson 473 SeaCoaster, 15' 10'' saving me the 16' and up registration costs.
On insurance check out Progressive, I don't care for their politics but they have great rates and also U.S. Boat which has insurance and towing insurance. Hagerty is more for rare classics and they charge accordingly. Also if you have a large personal liability addition on your homeowner's or auto policy it may serve to lower your boat rate. Hope this helps.
