I have been very happy with the Michelin Agilis tire 205 65 R15 C. While expensive they last as I am currently running at 50-60K with more tread life left. I tow small boats and carry outboards to 150 hp four strokes in my back area and have IPD springs and Bilstein shocks in the rear. These tires have a higher profile, thick sidewall (class C) and carry about 300 lbs more per tire than standard. The sidewalls carry the weight well with no sagging or ballooning typical of regular passenger tires. The tread life is outstanding and the tracking is very good. I had Yokohamas before and they were showing drastic wear at 20 K. Plus they did not seem as true circularity wise as the Michelin Agilis. I know my mileage went up a mpg or so as the car seems to roll easier.
The tire size 205 65 15 is perfect for the wagon. The tire is also not noisy. Best tire for a Volvo wagon ever. Typically standard on Vanagons and vans that need a stiffer sidewall to bear weight. I am really glad I found them and wikk never use anything else.
A terrific beefy tire.