Lexus 2004 LS430 Owner's Manual page 404

DRIVING TIPS
D Trailer hitch assemblies have different weight
capacities established by the hitch manufacturer.
Even though the vehicle may be physically capable of
towing a higher weight, the operator must determine
the maximum weight rating of the particular hitch
assembly and never exceed the maximum weight
rating specified for the trailer hitch. Exceeding the
maximum weight rating set by the trailer hitch
manufacturer can cause an accident resulting in
serious personal injuries.
D The gross vehicle weight must not exceed the Gross
Vehicle Weight Rating (GVWR) indicated on the
Certification Label. The gross vehicle weight is the
sum weight of the unloaded vehicle, driver,
passengers, luggage, hitch and trailer tongue load.
it also includes the weight of any special equipment
installed on your vehicle.
D The load on either the front or rear axle resulting from
distribution of the gross vehicle weight on both axles
must not exceed the Gross Axle Weight Rating
(GAWR) listed on the Certification Label.
384
32L017
" 1 Total trailer weight 2 Tongue load
D 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
x 100 = 9 to 11%
Total trailer weight
D 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.