Do they have a collector who buys hottwheels, harley Davidson cars and vintage barbies onsite?

Yes they should

That depends on what you have. Sure, there's plenty of collectors,and many vendors to sell to. However, the key is having what the vendors want to buy! Also, there's a protocol for selling. Visit the F& S site for details.

yes, many

There are a few vendors, I think for the Hotwheels they should be in aisle 100.

A few...