Trailer Recommendations - Hummer 2007 H2 Owner's Manual

Connect the adapter with the tab pointing up.
The flip cap on the vehicle's seven-wire harness
will lock onto the tab (see arrow in the previous
graphic) and help hold the adapter in place.
Plug the four-way round pin connector onto the
adapter.
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Trailer Recommendations

You must subtract your hitch loads from the Cargo
Weight Rating (CWR). CWR is the maximum
weight of the load your vehicle can carry. It doesn't
include the weight of the people inside, but you
can figure about 150 lbs. (68 kg) for each
seat. The total cargo load must not be more than
your vehicles CWR.
Weigh your vehicle with your trailer attached, so
that you won't go over the GVWR or GAWR. If you
are using a weight-distributing hitch, weigh the
vehicle without the spring bars in place.
You'll get the best performance if you spread out
the weight of your load the right way, and if
you choose the correct hitch and trailer brakes.
For more information see Towing a Trailer
on page 374.