Route plan with Google Map / Earth, need tech savvy help

Google Maps usually gives me real good routes. BUT. You gotta check these routes on an actual map to make sure they are feasible routes. Earlier this month I didn't verify the route and Google Maps routed me down Main Street in Mt Vernon, Wash. Sometimes the quickest route isn't the best.

The hard map I use is the Motor Carriers Atlas, which the truckers use. Suitable roads are highlighted in orange.