Here's a probably dumb question - I've got 26-inch tires, 36 spokes on my Schwinn Sierra GS. I'm not exactly easy on the bike - a lot of the roads I ride on are not very well maintained, with lots of crags and holes, and I bounce over some particularly hellish railroad tracks at times. It seems I throw my back tire out of true by looking at it funny - is this something:

1. That's bound to happen with the bad roads and railroad tracks?
2. That would be preventable if I had a better bike/frame/suspension? It could absorb some of that shock and keep the wheels from screwing up so much.
3. Or would better wheels than the stock wheels be necessary, even with 36 spokes?
And yes, I'm gonna learn how to true wheels myself if it's the death of me - got my copy of "Zinn and the Art of Road Bike Maintenance" ready to go next time I have trouble with it.