You can contact the Lake County Solid Waste Management Department (219) 769-3820
I'm in North Central Indiana -- Logansport -- and here we have an annual "Tire Amnesty Day" run by our city & county government. They take tires free, but it's limited to individuals, not businesses -- and if you truly have 1000 tires, I'm guessing it's some sort of a business! I would suggest you contact the closest recycling center and your local government offices and ask -- they truly do not want these tires to wind up in a riverbed or littering the countryside, so they may be willing to work with you. Thanks for taking the environmentally responsible approach!
If you have a large amount of tires, post them on your local craigslist, or yahoo freecycle groups.
Also try posting on yahoo gardening and homesteading groups.
You will be surprized how many people will come pick them up.
People use them for all sorts of projects, including raised garden beds, and building structures, ditch culverts, playground projects...etc.
If you know of local gardening clubs, exspecially for the elderly, ask them to spread the word on your free tires.
Advertise them in any local "free adds" paper or websites.
You may not have enough for the reponse!
I don't know about disposing of a thousand tires. I'm hoping it's an exaggeration. But....Our local Walmart will take old tires and only charges 60 cents a tire. Call and see if your Walmart does the same thing.