Here in B.C they are not required to have any such license, but there is talk of it.

Recreational vehicles are private use vehicles and not subject to the Federal rules and requirements for commercial vehicles that do require CDL license to operate.

This website spells it all out clearly.

@Cruiser I am not talking about a CDL just a special type license with a bit of training to show they have a clue as how to operate it on the road.
A lot of people can go from their Toyota right into a 40some foot motor home with no idea as how to drive the thing down the road.

Some states do require something

ChangingGears.com – ‘We have researched RV driver’s license requirements for all fifty states plus D.C. and compiled the summary below.’

Yes. Like some truck drivers who need a special endorsement added to their license to drive certain vehicles (passenger busses, extra long vehicles, hazardous cargo), they also should have special endorsements and training.

In 2009 we went with some friends to Colorado and we took two motor homes. The drivers were required to have a special license to drive the motor homes. This was in Illinois. The law may have changed since then.

In the UK you have to have the right category of licence to drive a motorhome over 3.5 tonnes (C1). You need another category if it’s over 7 tonnes©. Nowadays you have to pass an extra test but my C1 was automatically granted when I passed my test. Granny rights, it’s (sightly scarily) called.

You would think. But we have an RV and don’t need any special license. I don’t really understand it either.
Fortunately my husband has had some experience driving buses and rigs, so that’s nice.

Yes.
After 4, we should test and license by the wheel.

Absolutely. I’ve been driving (ordinary, passenger) cars for over 40 years, but I don’t feel qualified to drive one of those. If I wanted to drive one of those, I would definitely want to get extra training.