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On Oct 16, 4:46 am, Eric Greenwell wrote:
Dan G wrote: On Oct 12, 3:57 pm, "01-- Zero One" wrote: So to say that "Towing is simple. Follow these rules, and your rig will be stable in all conditions and not need stabiliser hitch." is in my experience a gross oversimplification. Think we'll have to agree to disagree - but I'd like to know of examples where these guidelines were met, but the rig was still unstable. My '89 Dodge Caravan and ASH 26 E trailer meets all your rules and is stable at 60 mph. At 70 mph, it's starting to quiver, and I've never dared go faster. So, is the rig "stable" or "unstable"? What's the speed limit for a towing vehicle in the US? In the UK it's 60, so your rig would be "stable", though of course it would be preferable to have a higher safety margin in the event of cross-winds etc. Let me try and explain this another way: *if your trailer is trying to lift the rear of your tow vehicle when hitched, it will have reduced stability than if it's pressing down. *If your trailer has a heavy mass at the far end, it will have reduced stability compared to if it had that mass in low down over the axle. *If your trailer has underinflated tyres, it will have reduced stability compared to if it had correctly inflated tyres (and they might go "bang", too) *If your trailer weighs more than your towcar, it will have reduced stability compared to if the towcar was heavier than the trailer. I hope that's clearer. The Bath University guidelines were also developed using average Euro cars - I would not expect an tall, unstable American SUV or pickup with ancient suspension to be particularly stable in many circumstances, even when not towing. More recent models with relatively modern suspension should, of course, fare better. Dan |
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