Cadillac 2009 DTS Owner's Manual page 294

If your vehicle is a Professional Vehicle, the vehicle
specific Certification label is provided by the final
stage manufacturer. The coach-builder should be
consulted if the final stage manufacturer's label is
not present. The Gross Vehicle Weight Rating
GVWR label should be on the driver's door edge.
If you do have a heavy load, you should spread it
out. See "Steps for Determining Correct Load
Limit" earlier in this section.
4-24
CAUTION:
{
Do not load the vehicle any heavier than the
Gross Vehicle Weight Rating (GVWR), or
either the maximum front or rear Gross Axle
Weight Rating (GAWR). If you do, parts on the
vehicle can break, and it can change the way
your vehicle handles. These could cause you
to lose control and crash. Also, overloading
can shorten the life of the vehicle.
Notice Overloading your vehicle may cause
:
damage. Repairs would not be covered by your
warranty. Do not overload your vehicle.