Lexus 2003 LS Owner's Manual page 306

DRIVING TIPS
32L002

Total trailer weight
A The trailer cargo load should be distributed so that
the tongue load is 9 to 11 % of the total trailer weight,
not exceeding the maximum of 90 kg (200 lb.).
Tongue load
Total trailer weight
A Never load the trailer with more weight in the back
than in the front. About 60 % of the trailer load should
be in the front half of the trailer and the remaining 40
% in the rear.
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Tongue load
x 100 = 9 to 11%
Hitches
A If you wish to install a trailer hitch, your Lexus dealer should
be consulted.
A Use only a hitch which is recommended by Lexus dealer
and conforms to the total trailer weight requirement.
A Follow the directions supplied by the hitch manufacturer.
Lubricate the hitch ball with a light coat of grease.
A Lexus recommends removing the trailer hitch whenever
you are not towing a trailer to reduce the possibility of
additional damage caused by the hitch if your vehicle is
struck from behind. After removing the hitch, seal any
mounting holes in the vehicle body to prevent entry of
pollutants such as exhaust fumes, dirt, water, etc.
NOTICE
A Install the trailer hitch using only the position
recommended by your Lexus dealer. Do not install
the trailer hitch on the bumper; this may cause body
damage.
A Do not use axle–mounted hitches as they can cause
damage to the axle housing, wheel bearings, wheels
or tires.