I think those rounded top B's are gorgeous industrial design. But too crude to drive.
I drove a thoroughly beat B dump truck once and my head was ringing and my ears hurt when i got out.
Huge wheel but huge effort too, this was man's work...your left arm was spinning and your right arm was pumping.
Today's rigs are Mercedes compared to the old Macks or any old trucks actually, but
they sure don't look as good.