Yes, the Donghai is an interesting bike. You see a few around every now and then.

One of Sabine's bikes (the vintage BMW) has a Donghai sidecar bucket, as does Jim Bryant's personal ride (also a vintage BMW ... that went around the world!). The Donghai sidecar buckets are nice, and Sabine's is extra nice because she had it customized by Jim ... extending it several inches for more legroom.

I was just at Jim's shop and noticed that he is storing a Xingfu for some absent owner. So, the "Happiness" bikes are definitely out there ... but probably ridden very little. Jim said he rode it once and his opinion was, well, "it is an old Chinese bike with character".