Class A is a wide brush stroke. There are overloaded, underloaded, towing, not towing.
Living in Denver we travel the mountains a lot. Sometimes I'll get behind a Class A towing going as low as 25, never 5. Our diesel can get down to 35 in Colorado towing.
As old timers, they are probably remembering way back to the 80s with aspirated gas engine RVs, and back then the worst were pickups pulling campers that were geared wrong. You don't see that today with diesels in the pickups.
2013 Winnebago Itasca Meridian 42E
2013 Jeep Wrangler Unlimited Sahara Towed