Tractor units will waste most average cars, especially 10 > 40 mph when running without a trailer.
The gearing kills them (extremely short) that said, I surprise no end of Chavs when running solo as its known.
Getting it rolling is always slow, once rolling, booting it in say low 7th gear will wake up the traction control, or, spin you 180deg if your not careful!
I often surprise white van man, even with an empty (or near empty) trailer, if anything, you can go that bit quicker with an empty on as it's weight largely stops the unit stepping out.