I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
The at fault driver is either mistaken or simply BS'ing you in an attempt to avoid the claim. Yes, Michigan is a no fault state, but no fault in MI means that your own insurance pays for your medical bills, wage loss and, the damage to other person's property that the driver hits with their car. Here is a link to a description of no-fault insurance in MI: http://michigan.gov/documents/cis_ofis_ip202_25083_7.pdf
While there will be a limit on the property damage covered under the no-fault policy, your client will be able to get up to the policy limit on the Property Protection Insurance (PPI) portion of the at fault driver's policy. If the driver will not provide the name and policy number of their policy, it should be available on the traffic collision report.
Finally, the owner of the rig that sustained damage may certainly sue in MI if need be---despite the fact that they may be domiciled in Ohio and the rig is registered in Ohio.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2015,