Buick 2002 Regal Owner's Manual page 213

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If you're using a weight carrying hitch or a
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weight distributing hitch, the trailer tongue (A)
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should weigh 10 15 percent of the total loaded
trailer weight (B).
After you've loaded your trailer, weigh the trailer and
then the tongue, separately, to see if the weights are
proper. If they aren't, you may be able to get them right
simply by moving some items around in the trailer.
4-38
Total Weight on Your Vehicle's Tires
Be sure your vehicle's tires are inflated to the upper
limit for cold tires. You'll find these numbers on the
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Tire Loading Information label (found inside the trunk
lid) or see "Loading Your Vehicle" in the Index. Then be
sure you don't go over the GVW limit for your vehicle,
including the weight of the trailer tongue.
Hitches
It's important to have the correct hitch equipment.
Crosswinds, large trucks going by and rough roads are
a few reasons why you'll need the right hitch. Here are
some rules to follow:
D
The rear bumper on your vehicle is not intended for
hitches. Do not attach rental hitches or other
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bumper type hitches to it. Use only a frame
hitch that does not attach to the bumper.
D
Will you have to make any holes in the body of your
vehicle when you install a trailer hitch? If you do,
then be sure to seal the holes later when you remove
the hitch. If you don't seal them, deadly carbon
monoxide (CO) from your exhaust can get into your
vehicle. See "Carbon Monoxide" in the Index.
Dirt and water can, too.
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mounted