Last new vehicle I bought (circa 2008) had the same instructions. Being a largely by the book guy, how can I tow for 500 miles at 50 mph without being bored?
DW and I took a leisurely weekend trip from Ewe-stun to San Antonio with the commitment to only go on FM roads. Worked out perfectly and, yes, there were several places where could have gone quite a bit over 50, but it wasn't required and made for a scenic and enjoyable trip.
I suspect there are several spots in Michigan where one can take a similar trip.