I was wondering if there is a "Trucker" GPS that will build a route based on easily user inputted "via" option. i.e If I'm loaded in OKC and need to go to SLC ... the GPS will probably route through Kansas and over to Denver, Cheyenne, etc. But I want to go via Albuquerque and Cortez. Is there one that easily lets the user enter "via Albuquerque" and it build the route accordingly? This would also be used to set the route according to carrier's routing instruction that may differ from the GPS unit's prefferred route. Thanks