With a truck, I could easily get a mountain bike, but am considering a used Dahon. There were a half dozen for sale on Craiglist here last summer all at the same time.
Also, I want to see about injecting the tires to make them flat free. I know tires come pre-made like that for bikes, but I'm not sure about the size for a folding bike.
I've gone to flat free tires on my wheelbarrrows and handtrucks.
Figured it would be worth it for a bicycle too.
My use would mainly be Howland Hill Rd in Jedediah Smith redwoods: the old wagon dirt gravel road. And the paved parkway in Prairie Creek redwoods, and the paved Bald Hills Rd. above Redwood National Park. Avenue of the Giants too.