I realize you are asking about higher end cars but...
As far as space a mini van is the best. Can carry 7 people and with the rear seats down or removed most will accommodate a 4x8 sheet. We had a Hyundai mini van for 10 years and it was built like a tank and rode pretty nice, the Kia Sedona is its equivalent.
As far as SUV we just bought a Ford Edge and it comes with a great crash rating. Hopefully we won't try that part out.
As far as space a mini van is the best. Can carry 7 people and with the rear seats down or removed most will accommodate a 4x8 sheet. We had a Hyundai mini van for 10 years and it was built like a tank and rode pretty nice, the Kia Sedona is its equivalent.
As far as SUV we just bought a Ford Edge and it comes with a great crash rating. Hopefully we won't try that part out.