Does exceeding manufacturers' tow rating void collision liability insurance?

Dne pondÄ›lÃ*, 10. zářÃ* 2012 20:21:01 UTC+2 Herbert kilian napsal(a):

a mechanical surge bread on ALL trailers. Since our Cobras and Komets
all have that feature and since all of us do diligently the required
maintenance and adjustments, towing with a smaller car should not be
an issue. Just don't put that home-built heavy trailer without brakes
behind that Golf!

More precisely saying, mechanical surge brage is in EU obligatory to trailers over 750 kg (up to 750 kg is voluntary).
But I have not seen 750 kg glider trailer without brakes so far. The reason is simple, for towing such trailer you need very heavy towing car. In EU, after installing towing device to car, you will obtain two limits for trailer weight - braked and unbraked. P.ex. on my PassatB5/150PS (considered to be among heavier half of towing cars in Europe:-) ) I have these limits 1300 kg braked / 650 kg unbraked. Limits are written on small Registration Certificate Part 1, then it could be checked by routine road police check...