I've had my RadRunner for 3 weeks now and have already experienced two flat tires on the rear. Both have occurred while riding on very popular local rail-trails - one gravel/cinder, the other tarred. The first flat was an old nail - not much you can do about that. The second, though, was a small wire - about the thickness of a standard office staple. I thought these tires would be tougher than this.
What are others experiencing? Are there any mitigation strategies I can employ to help? With the non-standard tire size, it seems my options are limited.

Thanks in advance for any responses!