On earlier trucks this might have been OK, but the latest trucks have computers controlling almost every safety function which brings all manner of new problems, particularly with Electronic Stability Programs. These systems have been obligatory since November 2014 and as we know make the truck safer by taking over most control functions when needed to prevent loss of control. The problem is the systems have finite operating limits and if axle loads or centre of gravity are outside of these limits ESP malfunction is a distinct possibility. Make no mistake, that is potentially extremely dangerous.zildjian wrote:Typically the percentage between front and back axles is around 30% on these trucks,
its interesting DVLA prefer apportion any weight allowance to (only) the rear alone, while its true the majority of the sprung weight is being increased with the addition of air bags,
then of course you are after all improving its unsprung envelope by replacing the (Four) road tyres with better rubber.
I can only imagine they are leaving the policing to VOSA at roadside with a calculator to work out the revised percentage,
and that dependant on how affable they find the driver.
on my Hilux for example, increasing its GVW to 3500 raises its rear axle and front axle rating proportionally at same 30% (ish)
my front axle was well within with camper anyway, now its slightly more well within,
with rear axle safely inside its new rating.
Manufacturers sell vehicles into different territories with varying specs on weight/power/suspension depending on local conditions, so I would imagine each countries version of DVLA are allowed some leeway on granting quite small adjustments in each category
For ESP to function correctly it's not only the maximum axle weights that need to be within range, it's the minimum too. In the case of the Amarok the minimum front axle load is between 1000 and 1180kg depending on rear axle loading. The absolute maximum rear axle loading by the way is 1860kg.
Special ESP programs are available for specialist body builders but I doubt they are available to the public, but as the axle weights are not negotiable anyway even if they were it wouldn't help. I guess it's the price we must pay for the astonishing safety, performance and comfort of these new trucks.
Best wishes
Gary
