Two weeks ago we completed a 53 day trip of 6500 miles. A friend who drives truck loaned me his Cobra Truckers GPS. It does not have some of the features of others but the 7 inch screen along with entering the size, wieght and length of the coach was a plus. The Cobra also advises of known speed traps. The Cobra did a great job giving us the proper lane to use at interchange and junctions. The Corba can be found on Ebay for under $300. It will also advise you of low under passes and wieght limited roads.