Specifications

It is extremely important that a minimum of five percent
(5%) and a maximum of ten percent (10%) of the total weight
on the trailer be felt at the trailer coupling ball when the
tongue is parallel to the ground. A bathroom scale can be
used for this determination.
For example, if the gross weight of the trailer, boat and
gear is 3,000 pounds, the weight on the tongue should not
be more than 300 pounds, but not less than 150. (Some
auto manufacturers say that tongue weight should not exceed
200 pounds when using a weight-carrying, bumper-mounted
hitch with full-sized cars.)
Check the tow vehicle owner’s manual.
The importance of an adequate download on the hitch ball cannot be over-stated.
the trailer hitCh
There are two basic types of trailer
hitches: a weight-carrying hitch and a weight-dis-
tribution hitch. A weight-carrying hitch is recom-
mended for use with a MasterCraft boat and trailer.
However, weight-distributing (equalizing) hitches
may be used. The chain must be vertical (straight
up and down) under the pulling load where the
actuator is extended. Excessive tongue weight be-
yond the actuator rating must be avoided as it will
reduce the brake performance and could damage
the actuator. Always follow the hitch manufactur-
er’s instructions. Before deciding upon which type
of hitch to use, also consult the automobile manu-
facturer on recommendations for the tow vehicle.
Be sure that the total weight of the 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 the trailer. The
correct ball diameter is marked on the
trailer coupler. The hitch should also
provide a place for attaching the trail-
er’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 Engineers; 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 the job be done by a professional. An authorized
MasterCraft dealer can offer advice.
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.
MasterCra Trailer Manual • Page 4