I think I'd be asking how does a disabled person drive a motorhome, change the gas bottles, empty the toilet thingy, get the awning out , convert the seating into beds etc?
Disability isn't always an obvious thing. There was an article last year about a young woman (I think she's 21) in Kent who was a blue badge holder. I can't remember what her disability was (either something to do with bowels or lungs) but she stated that majority of people thought she was perfectly fine and couldn't be disabled ... because she doesn't look disabled.
This doesn't mean I defend that motorhome owner.