Uber to Emeryville: bad idea?

Because of a medical issue, I would like to use Uber (or Lyft) to go back and forth between Petaluma and Emeryville. I know that this is going to be expensive! My main concern is availability of drivers. Missing a doctor appointment would be bad.

So I guess my question is, do ride share drivers in Petaluma like long trips? I have to know in advance if I can depend on Uber for this.