License requirements vary from state to state...
When I delivered trailers for Jayco, I had a Michigan Chauffeur License. I delivered all kinds of trailers from bungalow to a small one with surge brakes.
I was under contract to Jet Transportation (Jayco's delivery division) and had a magnetic sign with Jet's DOT number. I had to follow all the same DOT rules as a CDL driver regarding log books, hours, etc.
The truck at the beginning of this topic appears to be under contract to Star; one of many other companies that deliver RVs. It appears he has a magnetic sign that has been trimmed.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.