16" wheel and bridgestone Dueller on 350 cdi, any impression ?

Always remember that the more rubber you have between wheel rim and tarmac (in thickness, so to speak), the less stress there is on the steering, suspension, hubs, wheel bearings, etc. Not to speak of possible wheel damage.

The "loads" created by shocks/impacts due to road irregularities to these components are far far greater than vehicle weight itself.

If this doesn't make sense, jump off the roof of your G with your shoes on, onto the road surface next to it. That'll be the low profile tyre effect.

If you survive, do the same again but this time jump onto a couple of mattresses or a bouncy castle. That'll be a typical 75 profile tyre.

Not only with G's, but also with normal saloon cars, those with the big alloys and low profile tyres are always the ones with knackered steering racks, ball joints, shocks, etc.

The wider the tyre, the higher the risk of aqua planing as well.

And higher profile tyres also make for a much more comfortable ride.

To finally condemn low profiles, higher profiles generally provide better tyre grip during braking, due to front tyre deformation, as a result of load transfer, providing an advantage in this case, in the form of elongation of the contact patch.

Ok so a 75 section is perhaps too much of a compromise in terms of sidewall deflection during cornering. I'd say a 65 or 70 section is just about right for general every day use.