We live near Hamilton. We use both crossings but as stated above, it depends where in Michigan you are. The Ambassador Bridge is an easy crossing.
We always avoid the tunnel crossing. Both crossings are well marked and will put you on either the 401 or 402. You will not have any problem with your length. Both crossings are used heavily by billions of transport trucks every day.
2014 Triple E Regency GT24MB (Murphy Bed) with all the good stuff
towing a 2016 Jeep Cherokee TrailHawk
Berkley, the amazing camping cat missed dearly (1996-2012)