Never thought of it like that -- thanks --
All this talk about upping tyre pressures to the "Fully Laden" pressure when towing. Why? Most of us are only hitching a caravan up, typically 75Kg noseweight on the towbar. Fully Laden means 3 passengers in the back and luggage in the boot, according to our handbook, a possible 250 - 300Kg. Therefore we leave our pressures standard solo and towing.