The first 4 x characters on the TRIM ine are the paint combination code. This is the GMH code for what colour to paint the car, it is the code that appears on the rolling schedule and thus on the production broadcast sheet. The next 3 eg 18V are the trim colour and material.

The first 3 characters on the paint line you are refering to are the actual paint line used, in this case 567 is metallic and 568 is solid, but it also refers to high gloss eg 578 is the same paint but in satin, the lower areas blackouts on HQ Sandman (sills etc) are painted in 578-04149 which is a satin or low gloss black.

An original HZ Sandman van will be 1950kg, 2000kg or 2200kg. A normal one will be 2200kg (XU3), only those with passenger tyres (XX7) are 1950kg (1977) or 2000kg (1978 on). 1860kg is 6cyl HJ-HX XX7 van or V8 XX7 HJ-HZ ute.