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Thread: Suggestion for lowering GVM and Rear Axle load when towing a van

  1. #1
    Join Date
    Sep 2014
    Location
    Bathurst, NSW
    Posts
    200

    Suggestion for lowering GVM and Rear Axle load when towing a van

    I have been looking at options for trying to ensure I stay compliant with weights when towing the van. I have gone over weighbridge at tip a few times. GCM is never an issue, nor is Vans ATM or GTM. It's always the cars GVM and especially rear axle that will get you. When towing the van I always take a second spare for the D4. Just a case if on the blacktop, but I usually carry a full second spare on the roof rack (pioneer) as close to the front as I can.

    What I had manufactured at a local fabrication place was modelled of the standard caravan rear tyre carrier that bolts on the rear of the van. I got some D4 wheel nuts and high tensile bolts to suit and when towing van will move the spare tyre that normally sits underneath the D4 behind the axle, to be placed on the tyre carrier on the van. (The vans spare tyre is on a winch system and located underneath the van).

    I done done preliminary calculations based on weight of tyre and leverage effects of moving the spare from behind D4's rear axle. The Full tyre's weight is about 32kg. Due to leverage and location this adds about 40kg to rear axle and decreases front axle by 8kg. By placing the 32kg tyre at back of van will lower my van's towball weight by about 12kg which equated to about 20kg removed from rear axle and about 8kg added to FA.

    End result (and I accept my figures are very rubbery until I more accurately weigh, is:

    Van's ATM increased by 32kg (no big deal as I had over 200 kg available)
    Towball load reduced by 12kg, ( not much but will monitor van's towing).
    Car GVM (when towing) reduced by 44kg (tyres 32 and ball weight 12).
    Car's Rear Axle load reduced by 50-60kg

    When need to go offroad in just the car it will be 10 mins to move spare from back of van to back underneath D4. Will see how this solution works.

    spare caravan1.jpgspare caravan2.jpg
    2014 SDV6 SE, Fuji White, ARB bar, Fyrlyt 5000, Pioneer Platform, Traxide D4-5S, Maxxis 980 Bravo, GOE Compressor Plate, ICom-450 UHF, Red Arc Tow Pro.
    Elite Murray 2 Caravan 24'4" Tare-2917kg, ATM-3500kg

  2. #2
    Join Date
    Oct 2016
    Location
    Perth, AU
    Posts
    676
    Have you still got your third row seats installed? Bit of weight saving potential there...
    2010 TDV6 3.0L Discovery 4 SE, Alaska White, GME XRS-330c, IIDTool BT, Traxide D3-DU Dual Battery Kit, Apple CarPlay, Power and Heated Seat retrofit, Rhino Rack Batwing Awning (Part time install), Pirelli Scorpion ATR+

  3. #3
    Join Date
    Sep 2014
    Location
    Bathurst, NSW
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    200
    Quote Originally Posted by veebs View Post
    Have you still got your third row seats installed? Bit of weight saving potential there...
    Nah. Third row is out. Pulled it out when I put Drifta drawers in. Drawer weight is about the same as third row of seats. Even though I have fridge slide as part of drifta setup, I got the option of turning it (as well) into a side by side drawer setup, which is what I've turned it into. Gives me a flat surface at back. Going to experiment with fridge on second row of seats behind passenger which will put it mid axle rather than behind axle as is normal.
    2014 SDV6 SE, Fuji White, ARB bar, Fyrlyt 5000, Pioneer Platform, Traxide D4-5S, Maxxis 980 Bravo, GOE Compressor Plate, ICom-450 UHF, Red Arc Tow Pro.
    Elite Murray 2 Caravan 24'4" Tare-2917kg, ATM-3500kg

  4. #4
    Join Date
    Oct 2016
    Location
    Perth, AU
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    Quote Originally Posted by Briar View Post
    Nah. Third row is out. Pulled it out when I put Drifta drawers in. Drawer weight is about the same as third row of seats. Even though I have fridge slide as part of drifta setup, I got the option of turning it (as well) into a side by side drawer setup, which is what I've turned it into. Gives me a flat surface at back. Going to experiment with fridge on second row of seats behind passenger which will put it mid axle rather than behind axle as is normal.
    Is that their new '3 in one' setup? I was watching the video on it, looks pretty sweet, but probably more than I need... How have you found the Drifta kit?
    2010 TDV6 3.0L Discovery 4 SE, Alaska White, GME XRS-330c, IIDTool BT, Traxide D3-DU Dual Battery Kit, Apple CarPlay, Power and Heated Seat retrofit, Rhino Rack Batwing Awning (Part time install), Pirelli Scorpion ATR+

  5. #5
    Join Date
    Sep 2014
    Location
    Bathurst, NSW
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    Quote Originally Posted by veebs View Post
    Is that their new '3 in one' setup? I was watching the video on it, looks pretty sweet, but probably more than I need... How have you found the Drifta kit?
    No, not the 3 in 1. It probably has a name but you could call it a 2 in 1 setup. I had the original setup as fridge slide on left and single drawer on right. The fridge has the "box" that goes over fridge. However, I got it with another drawer that bolts onto the fridge slide. With a lid that goes over the now LHS drawer. So I've gone from single drawer on RHS with Fridge on LHS, to 2 drawers side by side. I'm finding it pretty convenient to have a larger flat surface in the back though.
    2014 SDV6 SE, Fuji White, ARB bar, Fyrlyt 5000, Pioneer Platform, Traxide D4-5S, Maxxis 980 Bravo, GOE Compressor Plate, ICom-450 UHF, Red Arc Tow Pro.
    Elite Murray 2 Caravan 24'4" Tare-2917kg, ATM-3500kg

  6. #6
    Join Date
    Sep 2014
    Location
    Bathurst, NSW
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    200
    Quote Originally Posted by veebs View Post
    Is that their new '3 in one' setup? I was watching the video on it, looks pretty sweet, but probably more than I need... How have you found the Drifta kit?
    Sorry. I've had the Drifta kit in for 2 1/2 years. So much for getting to WA with the van, stupid Covid. The drawers have been bullet proof. Very well made. Have a few friends also gone Drifta. All very happy. I particularly like the integrated pull out table that can be used as a bench or full size camping table. Also I was especially impressed with the ease of fully sliding out the RHS drawer, so I can easily get to the extra storage underneath. No other drawer system that I found enabled this as easily.
    2014 SDV6 SE, Fuji White, ARB bar, Fyrlyt 5000, Pioneer Platform, Traxide D4-5S, Maxxis 980 Bravo, GOE Compressor Plate, ICom-450 UHF, Red Arc Tow Pro.
    Elite Murray 2 Caravan 24'4" Tare-2917kg, ATM-3500kg

  7. #7
    Join Date
    Oct 2016
    Location
    Perth, AU
    Posts
    676
    Thanks for the review - I expected they would be good, but glad to hear real world feedback.
    2010 TDV6 3.0L Discovery 4 SE, Alaska White, GME XRS-330c, IIDTool BT, Traxide D3-DU Dual Battery Kit, Apple CarPlay, Power and Heated Seat retrofit, Rhino Rack Batwing Awning (Part time install), Pirelli Scorpion ATR+

  8. #8
    Join Date
    Jun 2013
    Location
    NSW Australia
    Posts
    1,228

    Suggestion for lowering GVM and Rear Axle load when towing a van

    Those weights calculations look well thought out. I would love you too pull the suspension fuse before moving the weight, then put it back in and do a lap of the block to recheck the weights
    Last edited by josh.huber; 10th August 2022 at 04:38 AM. Reason: Spelling errors
    If at first you do not succeed, maybe your just no good and should quit!

  9. #9
    Join Date
    Jun 2013
    Location
    NSW Australia
    Posts
    1,228
    Just to see if the auto leveling of the air suspension changes any of the weights.
    If at first you do not succeed, maybe your just no good and should quit!

  10. #10
    Join Date
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    29,225
    moving just one wheel is a pretty fine margin of error.. a weeks groceries will be greater...


    apart from that
    as an interested van owner--
    I have always thought the distance from centre of rear car axle to towball has much greater affect than first realised.
    how complicated is the formula you used to work this out?
    It should be part of the vehicle, like the tyre placard.
    "How long since you've visited The Good Oil?"

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