The most famous and successful car-boat is the Aquada, built by Gibbs Technology. Although, there are examples of car-boats dating back to the 1950's.
(in the US) If the car and trailer are properly equipped - and the tow vehicle is not over-loaded - and the car, boat, and trailer are properly licensed and registered I believe it is legal anwhere.
a car battery made for that vehicle
If your car can pull it, then yes. There are restrictions for each type and style of car. You will have to look into how much weight your car can handle.
The tongue of the boat trailer is the point where it hooks up to the hitch on the car. The length of the tongue is necessary to give some distance between the bow of the boat and the towing vehicle.
it is a boat with wheels or a car that floats
Henry Ford made the first vehicle, it was named The Model T.
boat trailer/cargo another car camper/rv
boat trailer/cargo another car camper/rv
IT was made because there was to much over crowed and people need a way to get to the city by car not by the boat which what they had to do.
You would have to specify what kind of vehicle this serial number is attached to in order for us to determine what year Model 949 with serial number AG7825 was made. We would need to know if it was a boat, a car, a truck, or a motorcycle.
None As every vehicle has many components, from many companies. There is not a single vehicle made by one person
put sheets of metal round the outside of the car.