SUV, van or station wagon? Lots of space is a must..

Hello together, we have a new car purchase in the near future. I write “again” because we have had a lot of bad luck with cars in the past years. Over 80,000,- purchase prices for 5 cars in 6 years (Audi A 6, 2x VW Touran, Chevrolet Orlando, Hyundai Santa Fe) an absolute must is a lot of space, since we have a dog with 80kg, as well as it must be an automatic. “luxury” equipment rather secondary (seat heating, Navi, sliding roof, leather cruise control etc.) as we this time ni I was thinking of Mercedes (we haven’t had it yet) whether it was a station wagon or bigger. However, I have read that some models are susceptible to rust…. Recommendations? Thank you LG