Empty trailers take longer to STOP

I seem to have a person here on these boards, (Tankergirl) who disagree's with what is the truth about stopping a loaded trailer over an empty trailer..

given weights, speeds, traction, it will ALWAYS TAKE LONGER to stop an empty trailer over a fully loaded one.....I DO NOT give out wrong advice to newbies, how can I when we have videos and book materials that prove this fact..??

here is one section, from a state CDL Manual mind you on this:

Section 6.1.3 – Brake Early

Control your speed whether fully loaded or empty.
Large combination vehicles take longer to stop
when they are empty than when they are fully
loaded. When lightly loaded, the very stiff
suspension springs and strong brakes give poor
traction and make it very easy to lock up the
wheels. Your trailer can swing out and strike other
vehicles. Your tractor can jackknife very quickly.
You also must be very careful about driving
"bobtail" tractors (tractors without semitrailers).
Tests have shown that bobtails can be very hard to
stop smoothly. It takes them longer to stop than a
tractor-semitrailer loaded to maximum gross
weight.
In any combination rig, allow lots of following
distance and look far ahead, so you can brake
early. Don't be caught by surprise and have to
make a "panic" stop.


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here is yet another from Section 2 of the CDL Manual:


The Effect of Speed on Stopping Distance.
Whenever you double your speed, it takes about
four times as much distance to stop and your
vehicle will have four times the destructive power if
it crashes. High speeds increase stopping
distances greatly. By slowing down a little, you can
gain a lot in reduced braking distance. See Figure
2.11
Stopping Distance Chart
Miles
Per
Hour
How Far
The Rig
Will
Travel in
One
Second
Driver
Reaction
Distance
Vehicle
Braking
Distance
Total
Stopping
Distance

15 mph 22 ft. 17 ft. 29 ft. 46 ft.
30 mph 44 ft. 33 ft. 115 ft. 148 ft.
45 mph 66 ft. 50 ft. 260 ft. 310 ft.
50 mph 73 ft. 55 ft. 320 ft. 375 ft.
55 mph 81 ft. 61 ft. 390 ft. 451 ft.
Figure 2.11

The Effect of Vehicle Weight on Stopping
Distance. The heavier the vehicle, the more work
the brakes must do to stop it, and the more heat
they absorb. But the brakes, tires, springs, and
shock absorbers on heavy vehicles are designed
to work best when the vehicle is fully loaded.
Empty trucks require greater stopping distances
because an empty vehicle has less traction


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i really wish she wouldn't go around saying i give out wrong advice...

how can i, when it's documented.....????

by the way, this WILL BE IN ALL CDL MANUALS across the country, as well as the training films schools will have to show the students, as it's REQUIRED training material, and questions WILL BE ASKED at the DMV....(the written portion of the tests)