Most "SUVs" are just station wagons with an extra inch of ground clearance. They aren't that heavy. A Prius, on the other hand is close to the weight of a light truck.
I was real confused by this. Wiki says Prius is in the range of 3,000 lbs. Much lighter than a truck of any sort.
Perhaps you meant to say Tesla Model X instead of Prius? That the closest comparison to an SUV. It weighs in at well over 5,000 lbs, which closer to the range of a light truck.
2005 Tacoma: 3,140 to 4,4100 lbs
2005 Ranger: 3,028 to 3,606 lbs
2003 S-10: 3,016 to 4,039 lbs