One primary advantage of a trike... weebles wobble but they don't fall down.
2 miles is a simple reference since that use to be my commute. I could easily walk that if needed, or just enjoy a granny climb at 2mph.
I had to check... ever found yourself on Nora Rd west of 155th? It has a sign that stated 12% grade... if you check the true grade, it hits 18%! ...And it too is only a half mile long. I think I can handle that.