About 10min after takeoff there will be no gravity, so the seats are practically useless anyway.
It's the pre-flight checks which will make the lack of seats a large issue, they need to be at the MAV at least 4 hours before launch and have the doors closed maybe an hour before takeoff (before that anyone not doing checks could sit in the rover)
It's the pre-flight checks which will make the lack of seats a large issue, they need to be at the MAV at least 4 hours before launch and have the doors closed maybe an hour before takeoff (before that anyone not doing checks could sit in the rover)