[Tagging] Restrictions based on the weight of a trailer

[Martin Vonwald]

Hi!

I'm looking for a possibility to tag the following traffic sign:
http://vonwald.info/osm/images/dscn5532.jpg
It forbids from 05:00 to 22:00 overtaking for HGV with a weight of
more than 7.5t and also for vehicles with a trailer, when the trailer
weights more than 750kg.

So far I have:
  overtaking:hgv:conditional=no @ (05:00-22:00 AND weight>7.5 )
  overtaking:trailer:conditional=no @ ????

My problem is I don't know how to tag the weight of the trailer. Do we
have a tag for this?

regards,
Martin