The Village of Bellevue Zoning Code states that either motor vehicles or trailers (boat, utility, jet ski, etc.) must be parked on a hard surface if parked in your front or side yard. A hard surface means either in your driveway or on an approved concrete/asphalt pad along the side of your garage. Please ensure that any concrete/asphalt pad has been properly permitted by the Village of Bellevue Inspections Division.
The only place where a trailer does not have to be kept on a hard surface is when it is parked in your rear yard. This does not apply to motor vehicles.