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How To
How To Tow a Trailer
By Miles Cook Email
If you ever plan to involve yourself in activities such
as boating, camping or some sort of automotive pastime, such as
auto crossing or drag racing, then chances are you'll need to
do some towing. While it may seem scary, towing an average-sized
trailer is really easier than it looks.
Two of the most important things to have when you tow are basic
common sense and the ability to adjust your driving. In other
words, when towing, everything you do while driving needs to be
done at about half the speed when compared to driving without
a trailer. When you turn, go much slower. When you accelerate,
do it much easier. When you brake, allow yourself a great deal
more space to stop. And when you change lanes, allow room for
your vehicle and the trailer.
The types of things you are likely going to tow are a boat, a
camper of some sort, or a car trailer that's usually home to a
race or show car. The following information on towing basics applies
to just about any type of towing application whether the trailer
is carrying a boat, a car, or any other item that needs a lift
from point A to point B. The universal nature of this information
is due to the fact that how much you can tow and what you tow
with are mainly based on weights and capacities.
For purposes of discussion, let's suppose you bought a boat and
want to tow it to a lake. As the photos illustrate, towing a boat
with a pickup truck is a very common way to go. As such, the tow
vehicle is a major consideration when pulling a trailer, making
that vehicle as important as what you're pulling.
As far as cars go, a full-size body-on-frame, rear-wheel-drive
car like a Ford Crown Victoria (rated to tow 2,000 pounds) or
Chevy Caprice is a basic minimum for towing anything approaching
the weight of a 2,000-pound trailer. For smaller trailers, a smaller
car can work, but for hauling anything more than 2,000 pounds
you're going to need a truly tow-friendly vehicle.
Ideally, a truck or an SUV is always a smart choice for towing
that boat or camper. Even a compact pickup like a Ford Ranger or Chevy Colorado is going to be better than just about any car. For
heavier loads (say more than 4,000 pounds) a half-ton truck like
a Ford F-150 or Chevy Silverado will meet the needs of just about
any of the trailer-towing basics we're discussing here. But even
among half-ton trucks, towing ability can vary. For example, an
F-150 with a 5.4-liter V8 will have a much easier time towing
a 5,000-pound load than one with a 4.6-liter V8 because it simply
has more horsepower and torque. Furthermore, the engine isn't
the only thing that can handle a heavier load. The transmission,
brakes and rear axle are also upgraded, along with the larger
engine. Beyond a typical half-ton truck, a three-quarter (such
as an F-250) or one-ton (F-350) can handle loads well beyond 5,000
pounds. For example, an F-250 with a 5.4-liter V8 and 3.73 gears
is rated to tow 12,500 pounds. Properly equipped, an F-150 is rated
to tow 8,000 pounds with a 5.4-liter V8, an automatic transmission
and 3.55 gears.
Besides the tow vehicle and the trailer, the other critical element
is, of course, the hitch. Trailer hitches are rated according
to capacity of the load weight and tongue weight. Load weight
is referenced in terms of Gross Trailer Weight (GTW, see chart
at the end of article). Tongue weight is the downward force exerted
on the hitch ball. This is usually calculated at 10-15 percent
of the maximum rated GTW. The tongue is usually formed from the
V-shaped merging of the trailer framerails at the front of the
trailer. The coupler of the trailer is what accepts the hitch
ball.
Once you know how much weight you'll be towing and that the weight
doesn't exceed the maximum towing capacity of your tow vehicle,
you're ready to determine the proper hitch. Many pickups and SUVs
come factory-equipped with a Class III hitch, which is the most
popular class of hitch. Most hitches bolt to the vehicle, and
while some are welded, a bolt-on installation is the method preferred
for attachment. For hauling any load (car, boat, camper, or whatever)
a Class III hitch can handle up to 5,000 pounds. For heavier boats
or campers, a Class IV hitch (up to 7,500 pounds) would be required,
and you might want to consider a three-quarter-ton truck at this
point as well. We'd recommend (especially on a compact or half-ton
pickup if not already equipped) going straight to a Class III
hitch, which is enough to tow most campers, car trailers and small-
to medium-sized boats.
All Class III and above hitches are made up of two basic parts.
The receiver part of the hitch is what actually attaches to the
tow vehicle. It has a framework that's bolted (or welded) to the
vehicle chassis. The receiver is a large square tube that accepts
a drawbar. The drawbar is a smaller square tube that slides into
the receiver and contains the trailer ball. The drawbar is fastened
to the receiver with a pin that slides through both pieces and
is held in place with a clip. Drawbars come in a variety of heights
to allow the trailer to ride at a level plane. For example, with
4x4 pickups, a drawbar can be selected that "drops" the ball to
a lower level. The size of the trailer ball also varies. There
are 1 7/8-, 2-, 2 ¼-, and 2 5/16-inch sizes, with the 2-inch size
being the standard.
With your tow rig, hitch and drawbar ready go, you now need a
trailer. Whether it's a boat trailer (as in our photos), a car
trailer or a camper of some type, the attachment to the tow vehicle
is the same. In general, a dual-axle trailer is also more desirable.
Dual axles provide better load distribution and in the event of
a tire failure, there's still one good tire on each side of the
trailer, which makes the whole package easier to handle if that
happens.
As you move to heavier trailers, you'll want to start considering
trailer brakes. The most popular type of trailer brakes are surge
and electric. Surge brakes work hydraulically using the force
of a forward shift in the trailer caused by deceleration to compress
a fluid cylinder and apply its brakes. Electric brakes have a
controller in the tow vehicle that senses brake pedal pressure
using a hydraulic pressure switch plumbed into the tow vehicle's
system. Of course the heavier the load, the more you'll want to
consider trailer brakes. We'd recommend looking at trailer brakes
for any GTW of more than 2,000 pounds.
As we mentioned at the beginning, your driving style when towing
a trailer needs to change dramatically. If you've never towed
a trailer before and you're nervous about it, we'd strongly recommend
seeking out someone who has had experience with towing. In general,
you need to remember that when you are towing, you have considerably
less room for margin of error. Your vehicle and trailer are much
less maneuverable and nimble than your car or truck is without
a trailer, and it's critical that you always compensate
for the added length the trailer adds when you change lanes so
that you don't run anyone off the road.
As far as added costs, besides the item you're towing, there is
the fact that your vehicle will use more gas. This is not insurmountable,
however. In fact, our experience with towing a boat across the
country revealed a smaller increase in fuel consumption than we
originally anticipated. Driving from Los Angeles to Chicago in
a Ford F-150 standard-cab pickup with a 5.4-liter V8, we averaged
16.5 mpg traveling at 75-80 mph over 2,363 miles. With a new boat
purchase in tow, the F-150 managed 13.2 mpg at 55-60 mph from
Chicago back to L.A. over 2,051 miles. The overall average for
the 4,414-mile jaunt was 14.8 mpg. However, we'll note that boats
are usually lighter than travel or camper trailers, and because
they are typically lower and more streamlined, don't create nearly
as much aerodynamic drag. A good-size travel trailer (5,000 pounds
or more) is going to impact fuel economy considerably more than
our results.
With heavier loads, the difference in fuel mileage between a gas-
and diesel-powered truck can be enough to offset the added purchase
price of a diesel. However, you'll also want to factor in that these days, diesel fuel can be notably
more expensive than gasoline; up to 40 cents a gallon in some
instances.
Finally, you'll want to consider the laws regarding towing. Every
state has different rules and regulations for towing a trailer.
We recommend checking your state's laws regarding what's cool
with towing and what's not. We can tell you that, at a minimum,
all trailers need to have working taillights and brake lights
and that most states require registration of the trailer with
the Department of Motor Vehicles.
Once you've thought about the driving styles, the laws and the
costs associated with towing a trailer, take a look at the accompanying
photos, captions and Q&A section for more
details. With the right tow vehicle, a proper Class III or bigger
hitch and a trailer that's in good repair, you'll be on your way
to the lake, the campgrounds or the racetrack with your hobbyhorse
of choice in short order.
Trailer Hitch Classification
| | Class I | 2,000 pounds GTW
| | Class II | 3,500 pounds GTW
| | Class III | 5,000 pounds GTW
| | Class IV | 7,500 pounds GTW
| | Class V | 10,000 pounds GTW
| | GTW=Gross Trailer Weight (including
car or boat together, if applicable) |
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