I would like to throw in a different perspective on rural training. I am a resident in a 1-2 rural training track and I looked hard at a lot of great programs, both rural and urban (but all unopposed). I think some of the RTT's have a lot to offer. For many of them you spend the first year working in a higher volume city hospital for your inpatient rotations. Then you move to a rural hospital/clinic for the next 2 years when the years are more clinic based with a longitudinal inpatient practice. Out of the graduates from my program all do OB and inpatient medicine, some do colonscopy/EGDs, 1 did c-sections (but no longer does), and all were trained to do the run of the mill outpatient stuff (colpos, IUDs, vasectomy, stress tests, lumps/bumps, etc).
I can't speak for all RTT's but a major advantage of some of them is the quality of the outpatient clinic experience. Since the residents make up a small proportion of a well functioning rural practice (ideally), we have a smaller proportion of the patients who seem to plague lots of resident only clinics: narcotics seekers, chronic pain patients, and the mentally ill (we still have our share, but it is more like a real-life rural practice).
I also think that once clinical volume crosses a certain threshold the quality of the experience is much more important than the quantity. I would rather have 10 great experiences treating someone with a CHF exacerbation (working side by side with an experienced rural FP who I know well), then 100 experiences treating the same kind of patient when I am too tired to see straight, and too busy to read about what I am seeing/doing.
In many RTT's you can get good procedural/inpatient experience because everyone in town knows that you want to be called for good cases. That is the way to get a higher-volume experience without doing 100s-1000s of admissions for CHF/COPD/cellulitis/RO MI/RSV/OD/EtOH.
The bottom line is that I think some RTTs combine the benefits of both urban and rural training. They aren't for everyone -- the major drawbacks are having to move between the 1st and 2nd year, and having a smaller peer group to hang out with. I think they are at least worth a close look for people who are preparing for rural practice.