As far as finding places to put the RV in the Okanagan...that is an A, not an O...you will be able to find spots. Once you head towards Squamish, are you going via Lilloett Highway 99, or Vancouver, #1? Via Lilloett is much much prettier and slower and twistier and nicer. Via Vancouver is just boring highway..but..there are open RV places that way. I suppose the questiuon then is...do you require an RV place? If so, then via Vancouver is it. If you can stand being on your own without wifi or tv for a day or two..and don't 'require' power for the microwave, you'll be good via Lilloett.
Gary Haupt