So, going by the ARN list, the trailer with chassis number 160 was ARN (rego) 101-097, Census number 6015G, Trailer, Cargo, 1/2 ton, 7.5x16 tyres. Disposed of in NSW but no date listed.
If it is chassis 166, it should be ARN (rego) 101-093, Census number 6015G, Trailer, Cargo, 1/2 ton, 7.5x16 tyres. Disposed of in NSW but no date listed.
Looks like it was a standard No.5 trailer.
Greg.