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Thread: Trailer rebuild
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20th January 2012, 04:29 PM #1Skwair2rownd
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Trailer rebuild
I have a 6x4 box trailer that is about 30yrs. old I am looking at rebuilding it and going to a 7x5.
The front and rear gates on it are shot, as are the hinges so they will need to be brand new.
The frame and side frames are all made with 65x50mm angle that is over 8mm thick!!
The sheet metal is about 3.5 mm thick!! so the thing is both heavy and strong.
I need some input on the resizing, if this proves feaible.- What is the best way to extend the frame? Should I remove the cross members from underneath an use these as extension parts?
- Where do I place a NEW axle in relation to the :
- The towball of the car
- The length of the tray
- The overall length of the trailer?
5. Should I have alonger drawbar and if so what should I use to construct it?
6. I intend to equip it with brakes for towing heavier loads perhaps up to about1750kgs.What springs do I need?
Many thanx in advance for any advice..
Cheers, artme
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20th January 2012 04:29 PM # ADSGoogle Adsense Advertisement
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21st January 2012, 05:58 PM #2SENIOR MEMBER
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The axle thing has been mentioned many times by Yonnee and goes like this.
Axle goes 25mm back from center of box for each 300mm of box length. So a 7 foot box (2.1m roughly) would have center of axle 175 mm (7x25) behind center of box.
But it's not a hard and fast rule so you can put it closer to the center of the box if you want.
A read through some of the trailer threads will give info on draw bar length (5ft from front of box, roughly).Dan
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22nd January 2012, 04:14 PM #3
Dan's got it bang on with the axle location, although I don't agree with going closer to the centre. Too close to the centre will cause it to want to swap ends at speed.
It's a bit of a Catch22 with this project. If it was just to lengthen it to 7X4, then I suggest removing the drawbar, adding a foot to the front chassis, floor & sides, then re-fitting the drawbar, leaving the axle location and guards where there they are. However, adding to both the length and width of the trailer, as well as increasing its carrying capacity, you'd be better off selling the 6X4 as it is, and building a bigger trailer from scratch. Because to increase both dimensions, the only thing you wont need to replace will be the coupling.
As for brakes and carrying capacity, there's a big jump in prices of parts at certain weights. Up to 1400Kg, you have options of Mechanical, Hydraulic or Electric brakes on "Slimline" (Ford) bearings. Between 1400Kg and 1600Kg, you require "Parallel" bearings and axles, which limits you to 10" drums. This in turn limits you to either Electric or 10" Dexter Hydraulic brakes which are an expensive jump over the 9" Indian hydraulic brake which the most commonly used. Over 1600Kg then requires a 2000Kg axle and requires 11" hydraulic or 12" Electric brakes, and the use of 16" Off road wheels and tyres.Too many projects, so little time, even less money!Are you a registered member? Why not? click here to register. It's free and only takes 37 seconds! Doing work around the home? Wander over to our sister site, Renovate Forum, for all your renovation queries.
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29th January 2012, 11:15 PM #4Skwair2rownd
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Thanks Yonnee.
I've decided it will be better to buy a new gal. trailer.
I will simply repair mine and sell it.
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