Marin County’s planning division has extended a two-year-old ban on overnight parking for oversized vehicles in downtown Bolinas. In advance of a hearing with the deputy zoning administrator last week, several downtown residents wrote in to express their support for continuing Measure X, which barred oversized vehicles like R.V.s from parking overnight along Wharf Road, Brighton Avenue and Park Avenue. Most people said parking remains difficult but that the rules have improved the situation and…