level riders
Submitted: Thursday, Jun 21, 2012 at 10:36
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Member - bill & netti p (VIC)
hi to all
we have just got our new hi lux duel cab to tow our single axle off road full caravan 2.2 tonne. Old hilux had heavier
suspension and was good but rough as. New car is sitting good but haven't tried it towing van as yet. . (heading around the NT gulf country) it has 270k on tow ball weight and wondering if level riders would transfer weight back or forward to give a bit more secure handling ( iv'e heard not to use them on bad undulating roads, or reversing ) Also thinking about a Super spring for hilux which will handle the weight and not upset ride to much with out going to heavy duty springs. I always appreciate
forum revues and look forward to comments
Regards Bill
Reply By: Member - Bruce C (NSW) - Thursday, Jun 21, 2012 at 15:39
Thursday, Jun 21, 2012 at 15:39
Hi Bill,
As the others have said, your towball weight is excessive.
It should be around the 10% of the van weight.
EG 220 kg on the ball in your stated case.
Every vehicle over 1 tonne benefits from a level ride system and the heavier the vehicle being towed the better the benefit providing the system is suited to the weight of the towed vehicle.
I first used a level ride system in 1972, which came with our first van, and decided at that moment, Iwas age 26, that I would never tow a van without them, the difference was that great.
They just lock the van and tow vehicle together as one unit and takes a lot of stress out of the job.
On very undulating surfaces, such as severely rutted roads, it is wise to remove them as they place undue stress on the tow bar. Mind you the ruts need to be fairly severe and lots of them to warrant removing them.
Hope this helps, Cheers, Bruce
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AnswerID:
489088
Reply By: Horacehighroller - Thursday, Jun 21, 2012 at 17:07
Thursday, Jun 21, 2012 at 17:07
I'm curious!
I have always been an advocate of level rides being fitted first before considering uprated rear springs to counter towball weight.
The level rides transfer excess weight from the rear axle of the tow vehicle and help to push down the front (thereby countering the lifting effect on the front of the towball weight)
It is suggested here that level rides should NOT be used under rough road conditions as they place excess load on the tow bar. I am not saying that is WRONG, but I don't understand how that can be the case.
(After all, if there is 200 kg pushing down on the ball, a levelride would effectively push the ball up to effectively negate a significant part of that ball weight - lets say 80 kgs. So, as far as the towbar tongue is concerned there is now only 120kgs pushing down. Surely this would be advantageous for both the towbar AND the rear
suspension, particularly on rough roads!
I don't want to start an arguement, I just want to clarify in my mind why rough roads and levelrides should not go together.
Peter
AnswerID:
489092
Follow Up By: Member - RobnJane(VIC) - Thursday, Jun 21, 2012 at 20:01
Thursday, Jun 21, 2012 at 20:01
Hi Peter and others,
I also am not wanting an arguement, however want to add to the discussion.
It is my understanding that 'level rides' work by transferring some of the load back via the tow bar to the front end of the car.
Clearly if weight is taken off the hitch area it must go somewhere, and that means the front end/
suspension. This may not seem too bad, and when on level to relatively level roads is normally not a concern, however once more serious undulations are encountered then (my understanding is) the weight transferred to the front end is subjected to a multiplier effect.
Depending on the multiplier, there is the potential to momentarily overload the front end, and if this is repeated often enough then there could
well be serious consequences.
My guess is that this is why some car manufacturers specifically advise not to use them.
So in the example Peter has used that 80kg needs to be multiplied by whatever the 'lever' ie load leveller dictates (depending on how it is adjusted)etc.
Hope this is of interest to you.
Rgds,
Rob.
FollowupID:
764242
Follow Up By: phil300 - Thursday, Jun 21, 2012 at 21:19
Thursday, Jun 21, 2012 at 21:19
Hi all
When tow vehicle and van are level the bars transfer x amount if you drive though a large dip front of vehicle up rear down front of van down rear up the load on the bars goes up 10x all this load is transferred into hitch then bolts that hold towbar to vehicle plus into the draw bar were the bars attach and if the bars are taken past there amount of spring bend they stay bent.
A lot of people with WHD use there jockey wheel to make it easy to connect bars ( lift after connecting van hook bars with no load drop jockey, bars are pre loaded )
Reversing is okay unless you put vehicle and van at right angles some bars will bind on drawr bar.
I still use and would not tow at speed on highway with out them would have to be a a track with large whoops or wash outs to cause probs then I would take them off and be driving to the conditions. some servos need to be watched drive in and out at as much angle to reduce the dip ( not both back wheels in toghter)
Vehicle Navara D40 Van Safari 236 van gvm 3000kg tow ball weight around 280 kg depends on how much water on board carry up to 240 litres
cheers Phil.
FollowupID:
764250
Reply By: GT Campers - Friday, Jun 22, 2012 at 18:37
Friday, Jun 22, 2012 at 18:37
Contrary to common opinion, from an engineering point of view a WDH adds enormous stresses into the rear section of the vehicle chassis. IT DOES NOT lighten the towball load. It increases it. After all, something has to force the vehicle nose back down and in this case the incredible forces required are transmitted from the rear to the front of the chassis, like a big lever. Do NOT use them off-bitumen. Legally, too, use of a WDH doesn't do anything to reduce the ball load. The only sensible and legal method is to reduce ball-load or choose a heavier/more suitable tow vehicle. The fact that more vehicle don't suffer catastrophic failure of chassis when towing (especially in rougher conditions) is more a matter of luck than design.
Just out of interest, what tyres do you have on your van to cope with that load off-road?
AnswerID:
489181