My friend who is a radio producer puts on a radio-themed, live variety show every few months, with readings, musical performances, and the like. Most recently, she did a show around the concept "Buried," so there were bits about root vegetables, funerals, cicadas, etc. She got my band to compose and play a funeral dirge, and while we marched in playing, some other people walked behind us carrying a coffin that another friend built for the occasion. After the show, I asked if I could keep the coffin (which is about five feet long).
After breaking an old Burley kid-hauler into its component parts and bolting them securely to the coffin, I now have the Coffin Cart:
It's big enough to carry both my children (6 and 9) and some packages, or band equipment, or an adult friend. When I had it parked outside the Laundromat, the lady who works there told me that people were crossing themselves as they walked by it.