Well, I am still waiting on the answer from the MSP, however in the mean time I have dug through the Michigan motor vehicle code. They never clearly define passenger vehicle or pickup truck....That said they do define motorhome and recreational vehicle, very clearly. The section about trailer towing clearly states passenger vehicle and pickup truck. It does not say motorhome in this section. Also I see in Section 257.1401-F that a motorhome is not included as a passenger vehicle. It looks like I have found a hole in the law, that is not clearly defined......based on this I am good to go, will have to see MSP's response.