What Dean said above. July 4th is Platinum Plus at NCV, so you can rule that out unless you buy this specific week. Otherwise, I think your chances of reserving are good. Also, if memory serves me, Platinum doesn't start immediately June 1 (and see my weather comment below.) Do you plan to use both or rent one? Trying to move across country to fulfill a reservation sounds terribly tedious to me. Also, the early summer weather along the beaches in Southern California typically has this moniker: June-Gloom, because the fog just rolls in and sticks around all day.