Ever denied parking spot even though you legally fit?

All Motor Homes are Recreational Vehicles, but so are 5ers and TTs. But a 5er or a TT can't be a MH without a motor.
As for parking garages and parking lots, a 'B' almost fits, but they're generally longer and taller than a car. Making all the parking spots in an underground garage 'B' compatible lowers the number of parking spots available in the same total space. I've seen a few open air parking lots that had spaces for RVs, but they were at the far end of the lot.