bullitt:
One company I worked for, 1980`s, paid an extra £5 per day if I pulled an “A” frame draw bar trailer instead of just the Class 3 prime mover rigid.
just as you say Bullitt …when I started I was on contract as plant operator /hgv3 driver ie 4wheeler driver ,if I drove a 6 wheeler class2 paid more but only for the hrs on it ,when I drove the lowloader as spare driver I received Mechanics rate !.but on night work it was all at 6 wheeler rate even if I drove the transit crew van
never did figure that out. 