as I said Shane this set up suits our needs adequately,no need for more weight or jam tins (pistons) unnecessarily using oxygen. as for weight distribution in van that be a commonsense issue evident to most vanners.four years ago heading up the newell to toogoom Queensland came across Hilux twincab and dual axle van tripped over and van split open, wife and I stopped to help. elderly couple shaken, bruised but OK, said van got sway up and could not control it. don't know what speed they were doing or how can was loaded as most of belongings were scattered over road, but was on raised section of highway over flood plains think before parkes or Forbes? looking at wreck I was happy to have crappy European suspension and short rear, axle to tow ball distance compared to long tow ball to axle distance and cart springs on rear of hi lux........jim
The pommy 'vans move around a LOT more than local vans. But correct themselves so long as you have some nose weight there. Aussie 'vans have lots of weight at the extremities which seems make them tow far more stable............................. right upto the point where they start swaying ...... at which point, all the mass at the ends takes control and you "loose it".
The grey nomad seem to have no idea how "on the edge" they are.
This is my setup ..... the shitbox and block of flats..... Average speed ... maybe 85km/h ...... I'm towing this massive wind sail. Almost without fail the grey nomads will catch me on cruise control .... pull out to pass me... they get about level with the towcar and they start swaying .... pulling back infront .... I'm shitting myself watching them sway and walk all over the road ........ They have no idea how close to disaster they are. The panic, slow a bit for 10minutes.... then hit up the cruise control and set it back to 100km/h ... an insane speed to be towing a wobbly at.
Google the bailey caravans towing stability tests. Bailey even goes to the extremes of placing the gas bottles over the axle. All of the weight is concentrated over the axle(s) and none at the ends. It'll walk around, but you should never "loose" it.