Microsoft Streets and Trip is a pretty good route planning tool that can be used while on or off line. After you have selected a start and end location and it has developed a route you can modify by dragging to desired detour/route. You can inport POI's such as casinos that allow RV's, low overpasses, etc. If you are online it will update road construction along your route. Not the best realtime turn by turn but excellent for route planning. Price is somewhere arount $25, maybe a little more.
Dawn and Mark
06 HR Endeavor 40 PET