Your story makes my cart idea more and more appealing. Or, judging from those pictures, a sled.

Every single day I curse my job. I've always considered it unfortunate to be doing hard physical labor for a living, while so many other people are getting paid a lot more to do practically no hard work at all. But I guess there is one good thing to be said about my job after all - it keeps me in shape. Spending 10 hours a day loading heavy freight by hand onto trucks makes carrying a pack in the woods a literal "walk in the park."