As long as you are not abusing the frame with fast curb hits or drops, or similar on trail, I don't see any reason a folder cannot be used on mild trails.

The front suspension fork sounds simple, not tons of travel, but that sounds in line with the capabilities of a folding frame.

As I've mentioned often, a homemade "Deltech cable" from kevlar or UHMWPE line will strengthen the frame and greatly reduce bending loads into the frame hinge. Dahon is supposed to make an "add-on Deltech" version but I have yet to see it.