Ordnance survey Sat nav for hgv

Has anyone heard anymore about the availability of the ordnance survey Sat nav software?  They did a survey of all roads suitable for hgv.  I thought it would be very useful to caravaners.  I'm sick of my Sat nav trying to take me down roads unsuitable for a caravan.  Ive tried various so called Sat nav supposedly suitable for hgvs and none of them are any good.