Walk every hour. It makes the trip longer but removes the risk of deep-vein thrombosis.
Yes its ok as long as ur not sitting more then 6 hours...n i would keep my feet elevated on the dash board
Be careful about having your feet on the dash. Heaven forbid a wreck happens it can injure you worse than if you were sitting properly. I would get out and walk maybe every hour. Good luck. My back kills me when I ride in a car lol.