Nice, Hikermor. The human body can surprise you, either way, when the chips are down. Impractical, difficult, damn near impossible, yes. You just don't know what you can or will do until faced with the situation. I would take some lessons from the North Vietnamese who pushed loaded bikes down the Ho Chi Minh trail. With an extension on the handlebars, a heavily loaded bike can be managed for long distances in difficult terrain. That is pushing the bike, not riding it. The Japanese used the same technique in WWII and accomplished what the British thought was impossible. A bike can carry a lot of food.

I will not bore you all with war stories, but I have done some extreme distances with heavy loads before. It seemed impossible at the time, but I survived. I was younger and leaner then though.