Crossing state lines, with parts

Jarlaxle said
No, wrong! You do NOT need a "chauffeur's licence" to drive commercially! You need a CDL if over the weight cutoff (26,000lbs combined, 10,000lb trailer). But you do NOT need anything beyond a DOT medical card otherwise!

Well, you seem pretty sure of yourself, so I won't waste my time arguing with you.

I ran my own business here which involved driving my plow truck, pulling mowers in the summer etc.

The guys HAD to have a chauffeurs license and my vehicles were no where near the weight limit, they were simply commercial vehicles.

No medical card necessary.