Here is an odd question. Has anyone used or know anyone who has used a type of mono walker on the trail? A mono walker is a type of cart that has one wheel that is pulled behind the hiker. Would cut down on mail drops and be able to go farther on trail without resupply.
shamrock
They would not be allowed in any wilderness areas, since they are a wheeled vehicle, but would be allowed where bikes are allowed. I think the idea would be fine if you don’t want weight on your back for whatever reason. If it’s a trail built for bikes, then rolling smoothly shouldn’t be a problem.
Guino
Interesting idea. It would have to have a pretty stout stabilizing strap around the hiker. The CT has some pretty long downhills full of rocks about the size of your head. The cart would be twisting and wobbling a lot. I would definitely give it a test some weekend before I set out for a long hike with it. Good luck!
Apple
These types of contraptions only work well on flat, featureless terrain like salt playas. Or on roads. Any hills or uneven terrain with obstructions, and the effort to keep the thing upright and moving forward would exceed the perceived benefit of increased haul capacity. Also, the weight of the cart alone, even if made from ultralight materials, would probably be equivalent to several days of extra food in the pack, which pretty much rules out any resupply distance advantage.
George Meegan, in his book The Longest Walk, used such a cart - he called it a Yoshi cart, named for his Japanese wife, who accompanied him on a mega-walk across the western hemisphere. They followed roads the whole way.
tron
http://www.monowalker.com This website has a type of mono cart. Its pretty cool. I guess they are made in Germany, if you go to the youtube video of it they go over all kinds of terrain. Other than the wilderness areas it isn’t a bad idea.
shamrock
I can just about promise that you will be hating life trying to pull one of these up and down mountain grades all day long. The mechanical advantage of the wheel is lost the moment you begin fighting gravity.
Although labor intensive on the uphills, hiking with a backpack on your back is extremely efficient energy-wise, due to the tight center of gravity focused directly over your body. When you spread the center of gravity out behind you, and are no longer directly attached to the load you’re hauling, all of those efficient vertically-aligned forces are transferred into very inefficient lateral forces. Rather than using the major muscle groups of your core and legs, now you’re using the small and easily fatigued arm and shoulder muscles. And you’re using them in ways they’re not really suited for. Pulling something from behind you all day long is a very unnatural activity. Again, it may be ok for flat terrain, but not for fighting with a wobbly load that either wants to roll back downhill away from you or mow you down from behind.
tron
When I was hiking the CT I came upon a camp that look to be a car campsite, with all the gear this family had, but we were not close to a road. I soon found out they had llamas, very cool. I am assuming they are allowed on all ct, but might be tough to go into town.
Chef
I have to agree with Tron.I think pulling a cart would get old fast. We did have folks this year on the CT who were pulling carts with bicycles who said it worked great. We had 2 guys with llamas too who said that was also great but they never went into town. Llamas dont make as many miles per day as hikers but they can eat local vegetation. They were extremely cool! 
APPLE
All great advice, thank you. Apple, I did think about llamas too. I love backpacking but always thinking of ways to go farther without resupply.
shamrock