I just had an idea. If you took a wheelbarrow and balanced the load perfectly on the axle so that there would be no tongue weight, you could then tie off the handles to the sides of a padded weight belt and it would take almost no exertion to pull it behind you over level ground. you wouldn't even notice it until you had to pull uphill with it. Not that it's really a viable bug out idea, but maybe in a more sedate, post carbon environment, that might make walking to the store easier.