National Interstate Insurance Co., an Ohio-based transportation insurance provider, announced that it is expanding its tow truck insurance product into the Midwest, North Central and Pacific Northwest states. The specialty product is offered exclusively through a network of appointed agents/brokers and general agencies.  Originally launched in 2004, National Interstate's tow truck product offers a full range of coverage, including on-hook and garagekeepers, and the company intends to continue expanding its portfolio with additional offerings throughout the year, it said in a release.