Although most of our naps (2hrs, more or less) were in the tent, she also napped in the backpack, while we hiked. Then, when we were finished, we could put the pack down and let her finish her nap. Would she stand for that? It's a bit like a carseat. What about a jogger, or are you backpacking in?
Good luck with you trip, we have had a wonderful time camping so far!