Whichever you choose make sure it has decent ground clearance! Our recent cape trip highlighted this, we had a cheaper trailer in our group and it got hammered underneath, the first day on the tele saw its stabilisers get mangled beyond repair, the underneath copped lots of hits, in contrast our cub brumby barely got touched the only thing to touch terra firma was the bash guard protecting the handbrake lever on the draw bar
Bonus of a higher trailer is you can go deeper in water with less worries!
Look at the size of the chassis rails, trailing arms and shocks, big bore shocks are the go here
Nothin wrong with Chinese as long as the quality is good, sadly this is not so common tho
Cheers