Having an off day

I thought those Days were gone,like 1972 when i got paid 10 bob more on BRS for having a 2 axle trailer rather than a single.
I fail to see why they should be paid more,we didn’t get more when it went up from 12mtrs to 13.5mtrs for trlrs,or if you drove a normal wagon and drag as opposed to an artic.
Up here the hgv license is given for 25mtrs.Soon that will be the standard throughout Europé purely for economical reasons.