We have been off road through the Rockies in Colorado and the desert in Arizona, Southern California, Nevada and Utah. For direstion we have always found a lot of great trail guide books that detailed all of these areas. We were hoping to head north to go wheeling through Wyoming, Idaho, Montana or the Dakotas. I can't find any good off road guide books or maps that would direct to any public trails in these areas. Any suggestions for trail guides or places to try?