1. The Monster says:

    I don’t know if you care about etymology, but it seems to be derived by analogy to ‘metric ton’ (1 Mg or 1000 Kg), which is about 10% larger than the ‘short ton’ of 2000 lbs. commonly referred to as ‘ton’ in the US.  Therefore, a ‘metric assload’ would be even larger than a normal assload.

  2. I read about this in “the Writer” and just had to respond.  I ended up writing a blog about it.  http://logikalblog.com/2009/11/17/metric-buttload/