TRUE and a wise interjection Andy. I hope no one hurtles along on soft tyres.
I was more trying to point out getting the right pressure is not straight forward, and I think many vans tyres may be overinflated. Tyres heat most in use doing sustained motorway speeds and this adds to air pressure. Not good if the tyre is already overinflated. Balloons pop loudest the harder they are!
Over 50 years of riding and driving I don't fear a 'blowout' at 30-40mph, especially if at the rear. I've had tyrewall bulges, screws and nails embedded, leaking wheel rims, porous inner-tubes, snapped wall wires, and escapades with re-treads).
The only thing I really fear is a blowout on a busy motorway at 70mph.
If the tyre is good the other risk is debris, and that speed you don't easily see it or may not be able to avoid it. (at 4.00am once on the M1 - on a bike - I casually went centre lane to avoid what I thought was a joining strip. It was an 8ft RSJ lying square across the lane!).
The other caution is CAUTION: drive square and quiet and turn the blxxdy music off occasionally! Check there is no unusual vibration or clicking (it may not be a bit of road grit - in NZ a while back and driving a camper a persistent click was the worn end of a 6 inch nail driven fully in)
Whatever the pressure FRICTION causes heating. Speed (revolutions X time) increases surface contact and the faster the speed the more the tyre heats. And pressure impacts on contact. The lower the pressure the bigger the footprint exposed to friction, and the more the tyre flexes (which also adds to heating).
The tendency of many is not to do a weekly TP check or inspect treads (damage, foreign objects and tracking wear); and to think punctures are rare events these days (which is true but not an excuse for complacency). AND don't drive overloaded!!! MH's often are given the poor load weights of many MH's
I said enough.
checks help to ensure your horizons never fade or your dreams evade