Max weight for Weber Coupling trailer My trailer is attached to my roadbike with a weber coupling system. How much weight can I pull safely without breaking my frame?
I can't comment on your specific hitch, here's a generalisation.

The normal quoted figure for an automotive trailer or caravan is ~45% weight on each wheel and 10% on the nose.

A bike trailer is likely a single axle - if yous has 3 or 4 wheels then it should stand by itself and noseweight is rough;y half the weight of the drawbar.



I've successfully pulled trailer with two heavy loads.

First was 68 kilos of car tyres, pulled for 20 km: thus



I've also carried 100 kilos of UPS hardware for 6 km.  That was right on the limit of comfort.  However I know the nose weight was around 9 kilos and each tyre carried 43-44 kilos.

NOTE This assumes your load is just stuff.  If you're hauling live people then absolutely stick to the manufacturer's recommended maximum weights.