Why are caravans built the way they are?
Submitted: Thursday, Apr 20, 2017 at 12:51
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Genny
A link to this American gadget came up on my Facebook page.
Towall Dolly
Why are caravans designed the way they are with one or two axles more or less in the middle?
Why not like a dog trailer, or with a steerable front bogie similar to this gadget?
Reply By: GREG T11 - Thursday, Apr 20, 2017 at 20:02
Thursday, Apr 20, 2017 at 20:02
The answer to your first question is easy. To provide enjoyment to those already sitting down with a cold one and to
test the relationship boundaries of otherwise happily married couples.
There is a good reason why heavy vehicle operators prefer a "dog" over a "pig" when constantly reversing. A caravan is technically a pig trailer.
The perils of weight make the bogie in OZ unrealistic, not many F series or similar used here which is the minimum you would want to have to be legal considering the whole concept is designed to free up load space in the tray. Other wise it is pointless.
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Reply By: swampy - Friday, Apr 21, 2017 at 08:59
Friday, Apr 21, 2017 at 08:59
hi
Even if the setup was all technically correct under say 2.5t why would u need a heavy vehicle license or similar to have this style of hitch ???
Not just for more nanny state legislation ....
If u are a competent driver this should not be a problem ..
The police and the Rta would have orgasmic fits while they could not write tickets fast enough LOL LOL
The RTA would have 2 registrations on this to confuse the matter like they have elseware .
If the Rta cannot understand something watch out and good luck with registration . There is huge proof of this all around .
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Follow Up By: Nomadic Navara - Friday, Apr 21, 2017 at 09:24
Friday, Apr 21, 2017 at 09:24
"The RTA would have 2 registrations on this to confuse the matter like they have elseware ."
Please explain yourself. there is only one registration fof a dog trailer.
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Follow Up By: Bob Y. - Qld - Friday, Apr 21, 2017 at 09:46
Friday, Apr 21, 2017 at 09:46
That's not entirely correct, Peter.
If the dog trailer had a ball race
turntable ie. the dolly was a permanent fixture on the trailer, then it's one rego.
In this example, the dolly can be easily removed/unhitched, therefor rego for ute, dolly & 'van/5th wheeler.
The only advantages I can see to this set up would be improved braking, and the visual enjoyment for bystanders, in reversing situations.
Bob
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Follow Up By: swampy - Friday, Apr 21, 2017 at 12:44
Friday, Apr 21, 2017 at 12:44
Hi
In other industries I am referring to in regard to dual registrations because of
""Lack of common sense by the RTA Lawyers "".
Also the unevenness by which the "law" is applied .
The Rta is catching up but still 20 years behind tying to apply law to uncommon equipment .
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Follow Up By: Nomadic Navara - Friday, Apr 21, 2017 at 12:51
Friday, Apr 21, 2017 at 12:51
Some people like to complicate things, don't they. "If the dog trailer had a ball race
turntable ie. the dolly was a permanent fixture on the trailer, then it's one rego." Who would build a caravan with the extra complication of a removable dolly? The caravan I have seen around the traps does not have a 5th wheel type front axle. It has Ackerman steering.
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Follow Up By: The Bantam - Saturday, Apr 22, 2017 at 08:55
Saturday, Apr 22, 2017 at 08:55
It is plain and simple and easily understood
If the dolly is not permanetly attached it requires a second regestration ...... it is a seperate vehicle and there simply is no and never will be a way around that.
AND .... if the dolly is a seperate vehicle, the rig becomes a multi-combination and requires an appropriate licence.
As for a plain and simple dog trailer ...... permanetly attcahed strreing front axle ...... single vehicle and capable of being towed like any other trailer within the weight allowances for the vehicle and licence held
cheers
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Reply By: 9900Eagle - Friday, Apr 21, 2017 at 14:57
Friday, Apr 21, 2017 at 14:57
Met an old sheering contractor form around
bedourie who had a converter dolly under his van. He was towing with an old petrol gas F truck and the reason for the dolly was he was way over his back axle weight with the van hooked on the F truck directly.
He was happy with it and said it towed
well. The old van also had air brakes which would have been a big plus.
AnswerID:
610408
Reply By: The Bantam - Saturday, Apr 22, 2017 at 09:11
Saturday, Apr 22, 2017 at 09:11
The reasons why some many things are not so in caravans in particular is pretty much a total lack of any significant innovation in the caravan business.
Caravans and trailers in general are crude, lumps of puss, built by very small poorly resourced companies ..... even the biggest builders would not have the size or resources on the smallest motor vehicle manufacturers.
The use of a towing dolly with a passenger vehicle on a passenger car licence ..... never will be legal. It is a seperate vehicle requires a seperate regestration and a multi-combnation licence.
As for Dog trailers ...... there is no reason whatsoever that caravans can not be built as dog trailers ...... many council and road crew caravans are dog trailers.
There is a mowing contractor in my area that has a small dog trailer he tows behind an SUV.
There are many good reasons why a dog trailer is a good format for a caravan or other trailer ...... stability being one of them.
The disadvantages are ....... cost and weight ...... there is significant extra cost and weight involved in building a sturdy and road worthy steerable front end AND there would be significant engineering design work involved.
Meanwhile ..... most of our simple crude vans and trailers have crude and often fundamentally flawed suspensions bolted straight to flat flat chassis ....... a great many do not even have shock absorbers.
Until trailer manufacturers can get past the idea of a flat steel beam chassis, propper
suspension geometry and just fitting shock absorbers ....... don't expect any further innovation.
cheers
AnswerID:
610430