I know there have been a lot of discussions about double strollers, front and back or side by side. My question is what would be a good "off road" double with big wheels? Our driveway is about 1/4 mile, hilly, and not paved. I have a double stroller (from babysitting two boys) that really doesn't work in my driveway. My big son (will be 10 yo) likes to walk for the bus before/after school, so I will be needing a stroller that can handle the rough terrain. Any recommendations (low-ish price) are greatly appreciated!