Sure. We don't have any sections that go for miles like that in our area, but there are a few shorter sections that get up there. On short hills, I can leg press my way up. With a CF seat to brace against on my highracer, I have plenty of leverage. On extended climbs, it's slower than a road bike, but I still drop most roadies (we're talking the sort that show up to recreational centuries and double centuries rather than hard core racers). On short climbs, I'm actually faster than I am on the road bike.

Even for steeper grades (over 6%) that go for miles, you just gear down and spin. My highracer weighs only 21 lbs with pedals and has 30x27 so it's pretty easy to move. The trike has a triple ring and a 20" wheel -- I could tow a boat with the stupid low gear inch numbers that yields.