Well then I have to appologise, I was just judging from youtube US driver videos and they did have airypumpysuspensiony seats…
What do I know… just watching youtube… 
no one let’s me in there to see for myself…
Surely driving those Flats on wheels without airsuspensionseats in straight line on highways can’t be worse than driving old tipper with hard suspension and old seat on these roads… ? 