Raving Toy Maniac

So I've got a bunch of 80's Tonka trucks that are still being stored in my parents basement. They are trying to sell their house and need them out. I don't really have the room to store them but not sure if I want to part with them becuase I might have one more kid (first was a boy). That's a big if and even if we did, it really won't matter to him that he's playing with my old beat up toys or new ones of his own to beat up.

I just want to know if they are worth anything before I get ripped off in garage sale. Any help would be appreciated