Most, if not all, larger RVs suitable for full-time or long-time living such as those that are likely to be used by your volunteers are wired for 50-amp service.
That being said, you can get by on 30-amp service with a 50-amp rig, but as has been stated, there may be some inconveniences. Having 50-amp service will attract more applicants, which will improve the chance of finding more highly-qualified volunteers. This is especially true if the National Forest is in the south where it is hot.
50-amp service is more expensive to install because it requires heavier gauge, 4-conductor wire instead of smaller, 3-conductor wire. However, the labor to install electric service is the biggest part of the cost and will be essentially the same regardless of whether it's 50 amps or 30.
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