Driving through flooded roads

Caraman wrote:

Sally wrote:..... I would have driven through water that covered the rubber on the tyre without a second thought (not at speed obviously, dead slow).  So I’m wondering what I’m missing. 

It’s a genuine question by the way, and I accept it may be me.

My van is on jacks at the moment but if it was not and the water level covered the rubber on the tyres I am pretty sure the water level would be up to the motorhome's wooden floor which is full of holes for wires, pipes and gas dropouts.  Some of Sargent's wiring harness with its spade connectors would be underwater as would the fresh and waste water tanks and their pipes, breathers, insulation & heaters, the underslung gas tank and regulator and in my case electrically operated levelling jacks and their control box which is bolted onto the underside of the floor.  None of these are designed to be immersed in water let alone water that is flowing due to the motion of the vehicle, wash from passing vehicles or if it is part of a river which it can often be on a flooded road.  Again I haven't checked it but I am pretty sure if the water level covered the tyres' rubber it would be significantly above the lower cab door seals and close to the AdBlue & diesel filler.  If I drove my Honda Jazz with water covering the rubber on its tyres, the water level would be halfway up the doors.  I shudder to think what harm could be done to its hybrid electrics let alone its petrol engine.