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Thread: Can a Disco 4 tow a van with 350kg ball weight... I think not fit for purpose..

  1. #131
    Join Date
    Feb 2005
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    Bracken Ridge - Brisbane - QLD
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    14,350
    Bloody facebook is watching my every move


    2000 110 Hardtop

  2. #132
    Join Date
    Mar 2007
    Location
    Warwick Qld
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    1,812
    TBW does NOT have to be 10% of ATM!
    That figure came out years ago as a ballpark figure for trailer building/loading. It has never been included in any regulation that I am aware of.
    All the figures in the world, punched into the most advanced supercomputer don't mean diddly squat.
    What matters is what a weighbridge tells you. If you are not exceeding any of the required weights (GVM, GCM, ATM, tyre and axle weight limits), then you are fine. When you have it setup to those specs, get a copy of the weighbridge docket, and keep it in a safe place, for "just in case" scenarios.
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    You have the right to remain silent. Anything you say will be misquoted, then used against you.
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    1999 Disco TD5 ("Bluey")
    1996 Disco 300 TDi ("Slo-Mo")
    1995 P38A 4.6 HSE ("The Limo")
    1966 No 5 Trailer (ARN 173 075) soon to be camper
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  3. #133
    Join Date
    Dec 2006
    Location
    Brisbane
    Posts
    86
    Quote Originally Posted by Pedro_The_Swift View Post
    total bull**** Evo,, nothing is built to those dimensions,, towball to axle = X,, behind axle to end of van = X ..

    its just a sales gimmick..
    Trailerable yachts can get really close to that setup. Different to motor boats and caravans because the heaviest part of the load tends to be the lead in the centreboard and many trailer builders like to set up the trailer with the axles directly under that mass. Additionally many yachties like to try avoiding dunking the wheel bearings when launching/retrieving thus axles tend to be further forward than your standard caravan setup and more like the X/X setup in this demo.

    A 27 foot aluminium 3T trailer sailer I tow at times is like that (dual axle). It tends to wander due to less tow ball weight so much so that Iím now looking at trying to change its trailer setup to improve things. The axles are mounted to a cradle system to which the trailer chassis is then mounted. Clearly itís all well secured but in theory the chassis could be moved further forward on the cradle for longer distance towing and then moved backwards for local towing work/launching/retrieving.

    Anyway, trailer sailer axles can look more like that setup once you put the boat on top with longer rear overhangs than youíd anticipate looking just at the trailer alone.
    2000 TD5 Discovery auto 7 seater.

  4. #134
    Join Date
    Dec 2006
    Location
    Brisbane
    Posts
    86
    Quote Originally Posted by tapda01 View Post
    Thanks Mick... I wish I was in the same position... both my tanks and most of the storage is forward of the axle. I have calculated the moment of all extras in the van (weight x distance from axle) to establish the new ball weight... I am going to have to move a tank behind the axle to bring the ball weight back to something reasonable...

    Cheers

    David
    Check me here please ... using moment calculations of weight x distance from axle to determine ball weight wonít work ... thatíll give you the torque applied to the axle by a given mass located somewhere along the chassis, not the added ball weight. For example, if the distance from ball to axle is say 4m and you have got a 40kg mass located 2m in front of the axle, using weight(mass) x distance from axle will give you a moment of 80Nm force acting on the axle in a rotational manner (torque) but doesnít mean the ball weight has increased by 80kg (and clearly not 40kg either).

    Youíll want to use a mechanical advantage calculation or similar to determine how much increase or decrease in ball weight placing masses in front or behind the axle will cause. Youíd use load length/lever length x mass added ... eg 2m/4m x 40 kg = 20kg for the example above.

    Or just load up and visit a weigh bridge to know. Has the OP given actual weights from a bridge to help out here? I looked through the thread but couldnít find any actual weights yet.
    2000 TD5 Discovery auto 7 seater.

  5. #135
    Join Date
    Dec 2011
    Location
    Adelaide
    Posts
    582
    Or buy on of these!
    s-l1600x.jpg
    2006 Disco 3, 4L V6 Petrol SE
    No 5 Trailer ARN 177-295
    SOLD Engineers Trailer - no id
    SOLD RAAF 231194 Perentie 110 GS - SIR ANGUS

  6. #136
    Join Date
    Oct 2007
    Location
    Brisbane West
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    5,647
    I have one of those. Great kit. Mine is Milenco brand but looks identical. Cheers.

  7. #137
    Join Date
    Jan 1970
    Location
    Logan
    Posts
    18,133
    Definitely need to use a row ball weight scale to get a real figure. I'm sceptical about the OP's calculation on a 350kg TBW. It seems too high to me, but the only way to be sure is to actually measure it.
    2009 Defender 110 2.4. ARB bulbar, Ironman winch, Safari snorkel, Steinbauer chip, AP HD clutch, Lightforce spots, larger tank, Off Road Systems drawer, Traxide 160 controller, Tekonsha brakes, Mulgo seat runners, Uniden UHF, Nuggetstuff seat corners, breathers, Polaris GPS.

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