Cappacino

Wondering if anyone could point me in the right direction. We spend a few days at a time on our boat and when we come to NSW will be looking at a secure storage facility where we can leave our vehicle and trailer that isn't too far from a marina. or decent boat ramp. At least a short taxi ride if possible. Looking at places - Port Stephens, Lake Macquarie, Brisbane Water, Brooklyn/Hawkesbury, Pittwater and Sydney Harbour. We have to be mindful of the route as our boat/trailer is over width on a tri axle... so the bigger easy to get to ramps with a jetty/pontoon are ideal. Are there any short term storage facilities where people leave their vehicles and trailers? Boat/ship yards that supply this service? What do others do that have large trailerable boats who go out on the water for a few days at a time? Quite happy to pay the going rate for secure parking.... just unsure if and where these facilities are located.