Gross vehicle weight rating - curb weight= payload capacityFor example, if you have a vehicle with a GVWR of 2500 pounds and its curb weight is 2000 pounds you would have 500 pounds of payload capacity. Increasing Payload Of course, you're not stuck with the original ratings. Truck manufacturers almost always offer an optional towing package. A truck that comes ready to tow from the factory has a wiring harness, a specialized "Class III" trailer hitch—rated for 5000 pounds gross trailer weight and 500 pounds tongue weight—a bigger engine and brakes, and a cooling system designed to handle the additional load. Gross trailer weight is the total mass of the trailer when it's loaded to capacity and includes the trailer itself, cargo, and all the necessary fluids needed for operation. The tongue weight refers to the downward force of the trailer coupler resting on the hitch itself; it's usually 10 to 15 percent of the gross trailer weight. Be sure to check the height of your bumper before and after loading your trailer, if the height doesn't decrease by an inch or so, reposition your load closer to the front of the trailer. Know your vehicle's limits While this sounds simple, it's something that throws owners and professionals alike for a loop. Cars, trucks, and SUV's all have different GVW's, and just because your minivan has a Class III hitch doesn't mean it can haul a 5000-pound boat. Knowing your vehicle's limits will save both you and the professional an afternoon's worth of headaches. Besides, if your vehicle is overloaded and a sharp-eyed police officer notices, you could be looking at a ticket. Do you have any questions about towing that weren't addressed above? Post them below in the comment section to be answered.
1.) Boat trailers' axles that do not have water resistant synthetic grease will have the petroleum based grease washed out and will have no lubrication when you hit the freeway. Even if these axles are sealed, chances are that eventually the petroleum grease will not last. These wheels are smaller and rotate many times more than larger wheels. 2.) All trailer wheels, including 5th wheelers and tent trailers, should have synthetic grease. 3.) The pulling vehicle should be equipped with synthetic in the engine and transmission for optimum protection.