I guess the questions are as follows.
Do you feel like its a bargain?
does the seller think he is selling too cheap?
If the answer is yes to both then your ahead

Seriously though, if your budget is up to the $10g mark, then I would be looking for a bare bones aussie made trailer.
Just my two cents. But if your happy with it and it gets you out and about then that is what really matters.
I understand the Perth market is definitely a fair bit tougher we less around.
BUT if you see one you like ask the seller if they will work with you on either transport etc etc.
I live in vic, I bought my trailer from brissy.
I sold my last boat to a chap in SA,
And bought a car for my cousin from margret river.
plus the market is still a little tough, so you will never know unless you ask someone.

Cheers
Evo