At one time all I rode to work on (22 miles) was my road race bike and I pulled a BOB Yak trailer. It's a great option with some down sides of course. So that's one option for you. I've also toured using the yak.

For a rear rack, one of the best brands, Tubus...makes two racks just for folks in your situation. The Logo and Cosmo allow for the panniers to be mounted farther back than on any other racks I've seen.

Look at these racks.

If your bike had mid-fork rack attach points on the fork I'd advise using front panniers instead, and that would eliminate the foot strike issues. The main reason for doing so is that adding more weight to the front of the bike stabilizes it since most of *your* weight is at the back. Adding more weight to the back makes the bike less stable. I'm pretty sure you don't have such a fork, do you?

Cheers,

Ron
Utah...for now.
Jasper, Banff, Calgary & Edmonton this July.