2021 OWNERS MANUAL / 402
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 oer 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.
With the trailer hooked up to the tow vehicle and the jack stowed, a
quick way to measure parallelism is to measure the distance from
the ground to the bottom of the frame at or between the tires, and
measure from the ground to the bottom of the frame at the swing
tongue. Ensure that the measurements are even. Failure to run the
trailer parallel to the ground may prematurely activate the surge
brakes. This can be corrected in a number of dierent ways. For
example, air pressure adjustable shock absorbers may be installed
on the tow vehicle, or you can switch from a weight-carrying to a
weight-distributing hitch. Consult with the tow vehicle’s dealer or
manufacturer.
If the total weight on the loaded trailer exceeds
the load capacity of the hitch on the tow
vehicle, the trailer may break free, which may
result in serious injury or death and/or property
damage. Never Attach The Trailer To Any Device
Between The Trailer And The Tow Vehicle.
Failure to use a two-inch (2”) hitch ball and mount rated to 8500-
lbs. or higher, where required, may result in failure of the hitch on
the tow vehicle and a loss of control of the trailer while towing,
which may cause serious injury or death.
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
Be sure that the total weight of the trailer-boat rig does not exceed
the hitch’s load capacity. The maximum permissible weight for the
hitch should be stamped on the hitch. 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. 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.
2021MCOwnerManualFINAL.indd 402 8/26/20 1:55 PM