A gps that allows you to put in multiple stops and optimize a route with features specifically for delivery?

Yeah, retail GPS do not have programming sophistication to create a route that has the built-in knowledge to take into account medians, traffic signage and lanes. UPS routes are also smaller geographic areas than a GPS and the ability of a large corporation to analyze them is infinitely greater than a small business. There are programmable GPS available, but they are expensive and I really don't know how easy they are to program. I'm sorry I have no real advice for you, perhaps this is a situation where simple pen and paper, experience and rote might be the best option with the use of the GPS you already have.