mainland boat launch with secured parking?

[knotoncall]

I'm looking to launch my cruiser in & around cresent beach to richmond/ ladner/ steveston area but the criteria is that the truck & trailer is secure for a week & some. does anyone know a marina or alternative?
Thanks
Brian

 

[The Penguin]

the north arm launch by the airport seems to have a 24hr person on site last time I used the ramp (8yrs ago)