Trailer
Eddie English will build what you need if you give him all of the info. If the boat is on an old trailer, then go to a scale and get it weighed. If not then add up everything not just the boat. If it's an outboard then you need to add the engine, fuel, any equipment, and the weight of the trailer for gross weight. Eddie will then tell you what you need. If you get brakes, then be sure that they are stainless disc, or they will be useless in no time even if you flush them. Again as others have said, go single axle if possible, and be sure that the trailer is long enough so that your tow vehicle tires are not in the water when you launch.