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Re: [TR] Trailer Physics

To: <triumphs@autox.team.net>
Subject: Re: [TR] Trailer Physics
From: "John Macartney" <standardtriumph@btinternet.com>
Date: Sat, 21 Jun 2008 19:45:35 +0100
I've been watching this thread with interest as when I'm not fiddling about 
with Triumphs, writing 
or talking about them - my wife and I like to spend as much time as we can in 
our trailer home 
somewhere in the UK. Mostly we do this at weekends. To input further comment on 
this thread, its a 
widely accepted practise in the UK and Europe that for safe towing - whether a 
caravan (trailer 
home) or a simple trailer, the following facts are observed:

1. A four wheeled trailer is better than a two wheeled trailer. The two extra 
wheels give valuable 
extra stability, especially in cross winds.
2. The all-up weight of whatever is on the towbar should not be more than 80% 
of the towing vehicle 
weight. A 90% weight is about the maximum. The police tend to take a strong 
interest in any heavy 
load that looks heavier than the tow vehicle.
3. If the towed load exceeds 350lbs total weight (including trailer weight) the 
trailer must have 
its own braking system. Usually this is a mechanical set-up activated by the 
telescoping action of 
the towhitch on the vehicle towball.
4. Trailer noseweight (the downward thrust on the car towball) should be 
between 70-100 kgs 
(140-200lbs approx). You can easily calculate this by placing a set of bathroom 
scales under the 
trailer tow hitch and supporting it with a piece of 3"x3" timber.
5. The load in the caravan or on the trailer should be placed ideally over the 
trailer axles and 
slightly nose heavy and calculated as in 4 above.
6. Speed is restricted to a maximum of 60mph.
7. Trailer tyres should never be the same as car tyres. You need considerable 
extra strength in the 
side walls. Mine are 8 ply steel and I change them every five years.

I have two trailer homes and a small household trailer, all of which are used 
regularly. While I 
always carefully check total trailer weight, load position and towball 
downthrust, all my trailers 
are fitted with an additional anti-snaking device that I can transfer from one 
unit to another. Even 
with a properly loaded trailer or caravan, snaking is often encountered by the 
suction effect of 
passing trucks and buses and my Bulldog set-up stops it even starting. Happily, 
all larger trailers 
and all caravans are now fitted as standard with an anti-snake lock when 
delivered from the factory.

FWIW....

Jonmac
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