Review of Portable Toilet in a Big Truck:
Thetford Porta Potti®
As we describe on our packing
list page,we had a portable toilet in our 18-wheeler from the very first load we ever took as professional truck drivers.
The type we bought in the early 1990s was a Thetford Porta Potti® 135,
similar to the one
We considered this item to be even more important than having
a bathroom at home because it served not only as
toilet, but also as a collection point for all waste water from
- cleaning dishes,
- brushing teeth, and
- washing hands.
The Thetford Brand of Portable Toilets
Although there are different brands and designs for portable
toilets, the only experience we have had as commercial truck drivers is
with the Thetford brand.
Thetford sells a number of different size portable toilets,
of which have two basic parts which we call
- a water reservoir (upper)
- a waste holding (lower) tank.
Attached to the top of the water reservoir tank is a seat and
There is also a bellows that upon being hand-depressed, pumps
from the upper tank into the bowl to "flush" waste toward the lower
A handle on the front of the waste holding tank slides to
either open or
close the "door" through which the waste and flush water flows.
pushed in, the door to the waste holding tank is closed.
Assembling and disassembling the Porta Potti® is very easy.
two tanks fit together and a slide mechanism locks them together.
(In newer models, the lock may be automatic.)
To dump the contents of the waste holding tank:
- disassemble the
- carry the lower tank to any regular commode (such as at a
rest area or truck stop),
- swing out the capped pipe,
- remove the cap,
the pipe over the toilet,
- tip it down toward the bowl and
- press the air
You may wish to start flushing the receiving commode just
before dumping your portable toilet so that the waste is removed
When the waste is evacuated properly, your hands never touch
it. (You can't say that about putting waste in a plastic bag or bottle.)
In general we have observed that, as Thetford's model numbers
go up, the larger the
tank and the greater the number of accessories.
We upgraded from the 135 model to the
155 model because of the increased capacity of the waste holding tank
(which means fewer trips to dump the waste).
As we recall, there may
also have been a problem with the bellows leaking water.
We have never
once had a problem with a leaking waste holding tank.
The Prohibition Against Portable Toilets In-Truck
Mike has about 16 years
of professional driving experience.
In all those years, the only
time when he did not have a portable toilet in his truck was the
13-month stretch during which he drove for Schneider, a trucking
forbade all such devices from their trucks.
Supposedly, the company's leadership was afraid that they
leak and damage their trucks.
Whether this was just a suspicion or they
had had a problem with a leaking mobile commode, we do not know.
strongly that if they were to investigate, they would find that the
Thetford brand is advertised as "sanitary, odorless, and leak proof."(1)
Cleaning the Porta Potti®
probably easier than cleaning your home's commode.
When we were based out of a residence, Mike would scrub our
portable toilet with dishwashing
liquid and a rag under running water outside, and let it air dry before
putting it back in his truck.
Toward the end of his time driving regionally, he regularly
cleaned the portable toilet, but still
rinsed it under running water.
The great advantage of having a portable toilet
in your truck
is that you no longer have to depend on the availability or cleanliness
of restrooms on the road.
You don't have to wait for the shipper or
consignee to open up to use their facilities.
As for restrooms in some
rest areas on the road, some are not cleaned as often as they should be.
You don't know who last sat on that public toilet or what he
or she left
behind for the next sitter to pick up!
In some cases, rest area
restrooms are not open to the public 24 hours
Any time you're parked and there is room in the waste holding
tank, you can use your portable toilet.
convenience has come in very handy over the years.
Vicki recalls a time
years ago when she was driving east across Nebraska late at night.
had eaten something for dinner that didn't agree with her and it roared
through her like a freight train.
With no rest area anywhere nearby, all
she had to do was
- park temporarily on the shoulder of an off ramp,
back into the sleeper,
- use the portable toilet and
- be on her way again.
She didn't even wake Mike, who was sound asleep.
- As important as we feel it is to have a mobile commode in
truck, it is just as important -- even absolutely essential -- to use a
holding tank deodorant to break down and control the smell of the waste.
- There are different brands of deodorizer available.
- We have
only ever bought the dry (powder) "CampaChem." (New units we have
bought come packed with the liquid variety.)
- Mike reports that the
formaldehyde-free powder does not work as well
him as the regular powder does.
Other Places to
- Mobile commodes can be used in other places besides a truck.
- Some people take theirs in boats.
- Most RVs come with built-in bathrooms,
but they can be used in recreational vehicles without one.
- We took our
portable toilet with us on a camping trip once and it performed
admirably. (No more using nasty camp site toilets!)
- The Porta Potti®
solidly built, unlike some emergency toilets that consist only of a
on a frame with a bag suspended underneath.
Personal and Truck Security Issues
While there are tangible benefits to having a portable toilet
in one's truck (that we share below), there are some
intangible benefits, too:
- During times when a driver is under a "hot load" -- or has
high value load -- it is best to stop one's truck for very short
of time. Having a portable toilet in one's truck eliminates the need to
spend the time walking back and forth to a public restroom.
- There are rough places around the nation where there may be
thugs waiting to ambush a driver or hijack a load. Rather than leaving
one's truck to use the bathroom, one can use the mobile commode in the
truck. Think of the peace of mind that comes from not risking getting
stabbed or clunked over the head by those bent on evil.
- Some professional drivers use a CPAP machine and must
with compliance standards. Having in-cab bathroom facilities could mean
the difference between meeting and not meeting the standards. For
example, the standard used by one of Mike's regional trucking companies
(as of May
14, 2009) was that a CPAP machine-using driver must use the machine at
least 4 hours every night while on the road and 70% of sleeping time
on the road. If a CPAP machine-using driver awakens during the night to
go to the bathroom and the machine is off for less than 30 minutes,
the machine is seen as being "on" for the full time. Drivers might like
to think it takes them less than 30 minutes to use the bathroom at
public facilities, but they cannot guarantee that they will not be
sidetracked on the way to or from the restroom.
The unit is designed to hold water in the top reservoir and
waste in the holding tank. Both of these can be heavy, individually or
combined. Do not strain your back attempting to carry it.
The only other potential drawback we know of to using a
toilet is trying to over fill
- either the water reservoir tank
- or the waste
We strongly recommend the Thetford Porta Potti® portable toilet for use
in an 18-wheel commercial motor vehicle.
And, of course, we recommend
that users clean their hands after using any toilet.
This is a larger version of the Thetford Porta Potti from Amazon.com, with which we have an affiliate relationship.
wrote about 10 reasons
you should consider having one in your truck.
Money saving tip: We'll
share a few money-saving tips with you on this page:
- You can shop around for a portable toilet, including buying
one second hand, in order to get the lowest cost. Just make sure that
you buy a used model, there are no cracks or leaks in either the upper
or lower holding tank. Vicki once bought a unit with a smaller fresh
water and smaller waste holding tank at a Goodwill store. The two pieces
were together. It was only when she separated them that she discovered
that the cap from the waste holding tank was missing. (This was
the reason why someone had donated it to the thrift store.)
- There are medical consequences from holding in urine or
for too long. According to Wikipedia:
- "Routinely resisting the urge to urinate can promote
urinary tract infection." (2)
- "If defecation is delayed for a prolonged period the
fecal matter may harden, resulting in constipation." (3)
Both situations may require medical treatment, whether with or
without the assistance of a health care professional. We encourage you
to void your body's waste as your body needs to! Having your own
comes in very handy for promoting your own health
- Don't risk getting a ticket for urinating on public
(such as a rest area parking lot) or for disposing of "trucker bombs"
improperly. Remember, once waste leaves your body, it is considered by
some to be a biohazard. If you use your own toilet -- and dispose of the
waste in an approved receptacle -- you don't have to worry about that.
- Depending on the micro-organisms or parasites present on a public toilet
seat, very serious and costly health consequences can result. You can
prevent the transfer of these entities to your body either by
training your body to void waste products without sitting or by using
your own portable toilet, cleaned to your own specifications.
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