If you do find enough probably will need to rent a car because of weight in your suit case!There's also the issue that most of the easily accessible dumps which were easy pickings in the 70s have been thoroughly dug in the decades since. If it was in a spot which is relatively easy to find there have likely been a lot of people digging there since you were last there.
Honestly, I think you will have better luck here in New England and older stuff too!When I was in high school I used to dig bottles from the 1910s at a dump in Florida. I now live in Massachusetts but I am thinking about flying down there and seeing if there are any bottles Do you think it is worth it?