Heres a golden rule to live your life by
"if it looks like a duck and quacks like a duck etc - etc"
feel free to come over and we can rip mine to pieces with tape measure in hand
WRT compliance my WA trailer building experience has taught me, if its already registered nobody gives a toss
so the only worry is insurance and that only comes into play if something goes wrong
that said ive seen some towbars fitted to bikes here in WA that from an engineering perspective wouldnt pass the pepsi challenge
but they get used frequently
the best one was the one bolted directly to the rear axle pin made from 50 x 6mm flat bar