Most expensive trailer mistakes happen on the quote, not on the highway. This desk covers how to write a brief a builder can price, how to read an Australian plate, and which questions separate a workshop from a brochure.
Walk the factory with a written question list. A builder who cannot answer compliance, weld procedure and after-sales in plain English is not ready for a deposit.
The chassis quote is not the job. Finish, compliance, running gear and the months you cannot work the trailer are where Australian custom builds blow their budgets.
ATM, GTM and tare are not workshop slang. They are the legal mass story on the plate, and payload is whatever is left after you subtract a trailer you have actually weighed.
A used custom trailer can be the honest buy if you inspect compliance, fatigue and rust, not just the paint. Here is the yard checklist we use across Australia.
A Gold Coast boat ramp at dawn is a better specifier than a catalogue. Match ATM, finish, coupling and wiring to salt, corrugations and the tow vehicle you actually own.