Specifications

Be sure that the total weight of your trailer-boat rig does not exceed the
hitch’s load capacity. The maximum weight it can handle is stamped on the hitch.
Also, be sure the hitch ball is the correct size to match the coupler on your trailer.
The correct ball diameter is marked on the trailer coupler. The hitch should also
provide a place for attaching the trailer’s safety cables–two rings or holes on
either side of the hitch ball.
A truck or van using a step bumper as the hitch platform will need to have
safety cable attachments such as
eye-bolts, as well as a hitch ball,
which has been installed according
to the Society of Automotive Engi-
neers; SAE J684 Standard. Installing
a light or heavy-duty hitch can be a
major undertaking. The hitch and its
installation must meet the SAE J684
Standard. It is recommended that
you have the job done by a profes-
sional. Your dealer can advise you.
To ensure that the boat is riding
properly on the trailer supports, the
trailer should be in a level position
when hitched to the tow vehicle. The
recommended height of the hitch
ball, according to the National
Marine Manufacturer’s Association
(“NMMA”), is 18 to 20 inches to
the top of the ball from the ground.
More importantly, failure to adjust to this height may prematurely activate the
surge brakes.
This can be corrected in a number of different ways. For example, you may
install air-pressure adjustable shock absorbers on the tow vehicle, or switch from
a weight-carrying hitch to a weight-distributing hitch. Again, consult with your tow
vehicle dealer.
In general, for Class 3 rigs (3,500 to 5,000 lbs.), a two-inch (2”) ball is the re-
quirement. For Class 4 (5,000 to 10,000 lbs.), a ball of either 2” or 3-5/16” will
be required.
If the total weight on your loaded trailer exceeds the load capacity of the hitch
on your tow vehicle, then the trailer may break free, which may result in serious
injury or death and/or property damage.
MasterCraft Trailers - Page 9