The idea of hiking with a hand cart meets with reactions which range from interest, through amazement to derisive laughter. I am calling this particular cart, for obvious reasons, the 'trundler'. There are plenty of photos, both of use and construction, with I hope enough text to make things clear. Use and construction make a very big page, so there is a split into two sections, with a total size of just over 600 Kbytes.
Using the trundler - where to trundle, and how to trundle
Making the trundler
The second section assumes you have read the first.