Duetsche Optik ad for a sale on Swiss 1/2 ton trailers. Interesting.

From the site:
Like all gear the Swiss Army musters out of service, is checked, reconditioned if necessary, and fully functional. In the case of these gorgeous trailers, we wonder if they were ever in use! Built entirely of heavy gauge steel by Langenthal AG 1973-1975 (see constructor plate), they show no sign of wear or any rust. Even the eye of the hitch still has the original paint on ‘em! Even the rubber shows no wear. These units have a load capacity of 500 kg (1100 lbs). Torsion-bar suspension! The empty weight is a hefty 250 kg (550 lbs). Straight sided boxes measuring 105cm x 197cm (41.34” x 77.56”), with a full width tailgate. These fabulous units have jack-stands, to hold it level when unhitched. Pintle hitch with shock-spring. Even has another hitch on the rear, for pulling multiple units. Note: there are no lights, only reflectors, so if you wanted to use ‘em on the roads, you’d need to wire ‘em. Perfect for jeeping. Strong as hell, but light enough for even a Suzuki Samurai to handle. The overall measurements: 147cm wide x 332cm long (58” x 131”) We have only 9 trailers!

From the site:
Like all gear the Swiss Army musters out of service, is checked, reconditioned if necessary, and fully functional. In the case of these gorgeous trailers, we wonder if they were ever in use! Built entirely of heavy gauge steel by Langenthal AG 1973-1975 (see constructor plate), they show no sign of wear or any rust. Even the eye of the hitch still has the original paint on ‘em! Even the rubber shows no wear. These units have a load capacity of 500 kg (1100 lbs). Torsion-bar suspension! The empty weight is a hefty 250 kg (550 lbs). Straight sided boxes measuring 105cm x 197cm (41.34” x 77.56”), with a full width tailgate. These fabulous units have jack-stands, to hold it level when unhitched. Pintle hitch with shock-spring. Even has another hitch on the rear, for pulling multiple units. Note: there are no lights, only reflectors, so if you wanted to use ‘em on the roads, you’d need to wire ‘em. Perfect for jeeping. Strong as hell, but light enough for even a Suzuki Samurai to handle. The overall measurements: 147cm wide x 332cm long (58” x 131”) We have only 9 trailers!