The empty weight of the trailer is on the papers 360Kg (793 lb) and actually the trailer has a weight of 440Kg (970lb) The smart has an trailer load of 450Kg (990lb) I can put 10Kg (22 lb) in the trailer. In Germany it isn't exactly regulated if you may add the vertical load of the Trailer hitch to the Trailer load. But I think that it is allowed, so the Trailer can weight 495Kg (1090 lb) if the vertical load is exactly 45kg (99 lb)So I can put 55Kg (121 lb) to the Trailer.
The Trailer is allmost completly camping ready with this weight, I only have to buy an gas-fridge for it, to have an cold coke in the Warm Camping holidays ^^. The Fridge have an weight of 20Kg (44lb)
I has installed an truma gas radiator, 4 lights, a 12V 55Ah Battery, an Battery charger, an 230V Inverter and 20l Water with a pump, and a 5KG (11lb) gas bottle. That is all includet in the actually weight.
In Germany the rules for Trailers are much more strictly as in the USA, In Germany arent electric brakes allowed, and German Trailers and cars always have a much lower vertical load then American Trailers. Usualy the vertical load is between 50 an 75Kg (110-165 lb)
Next weekend I drive to an big smart event in north Germany with the trailer. There will be over 100 smart, I'll think it will be funny with this trailer. When I drive with the Trailer all people looking at me ^^.
Smart+trailer has a length of 6,5m (6 yard) the length of a normaly US Pickup ^^