Know what the real towing capacity and towing speed of your vehicle is. I blew out the engine on a 4-cylinder Trooper pulling a 1200 lb. boat. The Trooper was rated to pull over 2000 lb. It was a very expensive lesson. Make your your trailer is suitable for hauling your boat.
Boat trailers can make towing easy or hell.
Subsequently, I had to get rid of it after several expensive and potentially dangerous breakdowns. Even without these major problems it was difficult to get the boat on and off the trailer and it never seemed to ride right behind my car. The replacement I got made all the difference in the world. It pulls easy and loading and unloading are simple. It can be very dangerous pulling a boat behind a improperly equipped vehicle.