I was wondering what are the longest carriage road/railtrail/bike path routes in North America? I want to design a trip for my wife, my dog, and I for the summer. I want to avoid car-travelled roads to minimize difficulties of taking my dog. While a few road crossings and routes are OK, I know our needs and do not want to put the dog in a trailer most of the day because of cars.
The idea is that my wife and I would ride with pooch on dirt and rock trails for the tour, but that these trails would not require mountain bikes. Nothing that would require tires wider than 40 mm.
I know these kinds of route exist, but I simply don't know where they are.