Double happiness are a cheap Chinese super budget tyre.
Double coin are a slightly more ‘premium’ (if you can call it that) Chinese tyre, although they are partnered with Michelin. Their super singles use a Michelin carcass.
We sell and supply truck tyres as well as haulage, and have never really has any issues with a Double Coin Super singles. We supply them as trailer tyres and steer tyres on tractor units, rigids and specialist hiabs etc. Feed back has been pretty good on all fronts. Everyone seems to re-order if they have used them. We run them ourselves on trailers and as steers or tags on a couple of our units too.
Double Happiness on the other hand… we’ve supplied 2 295’s as tag axle tyres. They came back to us within a few months with sidewall irregularities. The outers of the sidewalls developed bumps all the way around the circumference. Suspected sidewall failures,on both tyres. Needless to say they were returned and we’ve not supplied them since. I wouldn’t run them at all.