I bought one of these from Bob at Gal Aluminium at Mt Druitt a year ago. Mine doesn't have locker on draw bar or lid or sides ... minimal ... approx 100kg. I needed as light as possible to tow with the little car as well as move trailer around on my steep driveway. I even got alloy wheels (with lock nuts). My guess is with Gixxer and boxes / ramp / spares / etc I load on trailer it's around 300-330kg all up ... car is rated to tow 500kg. Not suppose to rust and never needs painting. I only wish he had run electrical cables external to the box section as it made adding parts and screwing to the side rails tricky. He makes enclosed ones too ... but exxy.

http://www.ebay.com.au/itm/ALUMINUM-...item19e599d8df