Oh boy, I trust Motorwerks as much as I trust a leaky raft, I've been to the dealership a few times and will not go back, I wouldn't trust their opinion either. Unfortunately Sears in Minnetonka isn't much better.
Think about it though, your going to spend 80 Gs on a car then drive it in the winter? The salt, rocks, ice, its not worth it. Keep your wagon, get the 6er--drive it in the summer.
It's not a matter of can you--its a matter of should you.