Drawbar Boxes etc ...
Submitted: Sunday, Apr 18, 2010 at 19:32
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Mandrake's Solar Power
I am having a drawbar box built to house spare tyre (trailer's) 2 Jerry can water and fuel , porta-potty . and gas bottle ...
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When fully loaded it will probably add about 100 Kgs to the drawbar - Still
well under the 210 allowed by Jeep towbar specs ...
Do I need to do anything with Motor Vehicle Reg - Roadworthy ??
For info this will be made from 2.5mm Aluminium sheet and will have drop sides and locakble lid ..
Cheers
Steve
Reply By: crd patrol - Sunday, Apr 18, 2010 at 20:20
Sunday, Apr 18, 2010 at 20:20
Steve,
Just make sure where it attaches to the drawbar is strong enough to take the maximum weight you are going to add to it.
I just got a trailer made with a box on the front (1200mm x 1200mm x 700mm) and they used 6 small tek screws to hold it to the drawbar, nothing else, I actually thought it was gong to fall off on the trip
home. I have since fixed this myself and now the box sits on a subframe and that is bolted to 6 angle brackets welded to the chassis rails with 6, 3/8 high tensile bolts with nyloc nuts and spring washers. Yes I know I should have taken it straight back but I needed the trailer for a trip up north, and as the old saying goes "if you want something done right do it yourself"
crd
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Follow Up By: Mandrake's Solar Power- Sunday, Apr 18, 2010 at 20:39
Sunday, Apr 18, 2010 at 20:39
There will be a steel angle sub frame to hold the whole box in place - not sure about the fastening yet but will
check with the builder when I deliver the Tardis to him next weekend for assembly ..
Thanks
Steve
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Reply By: Member - The Bushwhackers -NSW - Sunday, Apr 18, 2010 at 21:05
Sunday, Apr 18, 2010 at 21:05
Hi Steve
I'm not sure you are 'adding 100kg', you already have the spare and gas bottle mounted on the A frame anyway, so just the weight of the box itself (prob not too much as it's aluminium, 2 jerrys (say 45 kg when full), and porta potti (reckon
mine weighs about 5kg empty).
If the box is set back as close to the pod as possible, to minimise the mechanical advantage of the weight, it will be better still.
You still need to make sure, as others have said, that the A frame is strong enough, and the box securely fixed. Like I said, half the weight that is going in the box is already on the frame, all you are really doing is rearranging the distribution of that weight, and adding some.
Cheers, Dave
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Reply By: CJ - Tuesday, Apr 20, 2010 at 17:15
Tuesday, Apr 20, 2010 at 17:15
Lex,
The further back the centre of gravity is from the tow vehicle, the higher the speed that it can be towed. That is the general law applied.
Even if you attach slays insted of wheels, this basic law applies equally.
Manyufacturers have to balance functionality, so drawbars can't are too long. But then we the users load the front up, so we bring the horizontal centre of the load forward, and decrase safe towing speeds
CJ
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Follow Up By: CJ - Tuesday, Apr 20, 2010 at 17:57
Tuesday, Apr 20, 2010 at 17:57
fat fingers typing too fast sorry for the typos
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