There are quite a few bikes which can take a regular 29" or a 27.5+, the overall rolling radius is similar. Some people have 2 wheelsets and swap them over depending where they are riding.
That might be overcomplicating it though, for what it sounds like you will be riding I'd probably just go with a 29er hardtail. 29" wheels do roll along very well.
I don't know anything about Surly bikes so can't comment on them in particular.
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