What are the picnic tables for?
Picnics of course. They can’t be used while the car is moving because everything would slide into your lap. M’lord and m’lady, stopping briefly by the roadside for a snack and a glass of bubbly while travelling, wouldn’t have to eat from plates in their laps; and they would have somewhere to put the crystal champagne flute (or gin and tonic glass) between sips. Lesser cars have cupholders; in a Rolls-Royce you have picnic tables.