I have to disagree about the Michelin Atlas. Normally Michelin folding maps of areas are superb in every detail and if you want to traverse the Sahara Desert or a European or African Country they are the ONLY map to get for sure. BUT their US atlas suffers from some problems.
Its chopped up with states not all on one page, the states are not in alphabetical order and the mileage tables are very slim (now I am writing this from memory of several years ago so it may have changed)
I find it hard to use
The Rand McNalley Motor Carriers Atlas has several advantages for people with large vehicles: One: all roads that are ok for Tractor trailers are colored yellow overlay. And it has the most extensive mileage tables of any atlas out there. Yes the print is small but we probably all have reading glasses anyway.
The large print atlases leave out too many details by necessity.
They are not a huge cost so If I were you buy both and see which ends up being your "go to" atlas...
My big complaint about the RMN is their treatment of Mexico. My guess is that more tourists go to Mexico than Canada Yet the whole country of Mexico is relegated to one page whereas Canada is given a Page per province at a pretty good scale. They need to change this obvious bias.