I also use the
DeLorme Gazetteer map series, as well as the
Benchmark Maps Road & Recreation Atlas series of state maps for general backroad reference. The Benchmark Maps series has somewhat better printing quality, with pseudo-3D shadow shading. I like having both maps.
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DeLorme Atlas & Gazetteer series of state maps
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Benchmark Maps Road & Recreation Atlas series of state maps
Trail books? Well, they're not maps per se, but my favorite (by far!) backroad and 4x4 guides for the southwest states are the "Backcountry Adventures" Peter Massey and Jeanne Wilson -- beautiful color photographs, history, maps, and trip logs (both ways) with mileage, turnoffs, and gps coordinates. I have the whole series, and use them all the time.
Backcountry Adventure Series
Backcountry Adventures: ARIZONA
Backcountry Adventures: NORTHERN CALIFORNIA
Backcountry Adventures: SOUTHERN CALIFORNIA
Backcountry Adventures: UTAH
4WD Adventures: COLORADO