From the Interstate Emergency Vehicles Facebook page:

Dear Friends
We are excited to announce that Rosenbauer America, the worlds largest builder of fire apparatus has provided us with the opportunity and a great future for our business & employees. Interstate Emergency Vehicles, based in Joliet, Illinois in our new 12,000 square foot facility is ready for the challenge. We wish to thank our customers in the Chicagoland area and Northwest Indiana for the continued support of fire truck sales and the privilege to service your emergency vehicles.
Sincerely,
Ed Orolin