delicagirl
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just as a comparison my 2.8 tonne transit panel van is on 195 14s , tyres are bog standard cheap ones, sidewalls say max 900kg at 65 psi
if your running somewhere in the 2.5 to 3 tonne range your rear tyres at 44psi are overloaded, if theyre rated at 800kg you need to be running near max pressure. even then the rear could be overloaded because of the uneven load distribution between front and rear. be worth putting heavy stuff as far forward as possible
basically tyres blow out because the sidewalls are flexing too much, increasing the pressure reduces the flexing, driving style and speed also has an effect. heavier rated tyres have stiffer sidewalls . get the sidewalls too stiff and the ride gets harder cos the tyre doesnt flex over bumps and grip is reduced cos the tyre doesnt mould onto the road so well.
sounds like you need to talk to a decent commercial tyre fitter
i just recalled a commercial firm i talked to in Shepton last year - they were quite helpful - i assume their tyre fitter will need to know each axle weight so i guess my first port of call is the weigh bridge again.
Forgive my naiveity in this... but wouldn't it be more practical to take a full van to be weighed, so that the tyre fitter knows what weight the tyres will be carrying when i am fully loaded ?