When do you guys put them on/take them off?
You said that good drivers and bad drivers can't generate traction where there is none.
By saying a diffrent vehicle yes your right, but with trucks they have plenty more torque and more horses under the bonnet to pull 44 tonne uphill, so it's alot easier to lose traction.
They don't use appropriate tyres like spikes or massive grips there standard truck tyres.
My point in this is good drivers are able to drive a vehicle and gain traction most of the time.
That surprises me to be honest! An old Audi A4 quattro I used last year was superb in the snow, seemed to go anywhere! It had cheap no-brand tyres with plenty of tread.