from crutches: 
Chinese Wheelbarrow https://www.lowtechmagazine.com/2011/12/the-chinese-wheelbarrow.html
2021-09-09 21:37:06
No-weld bike trailer https://www.youtube.com/watch?v=kHwX_x-4SrQ
PVC bike trailer https://www.youtube.com/watch?v=QcxcH2UeamU