I'm building a power wheelbarrow and want some input from those who use them. Mine will be using a hydro transaxle from a lawn tractor and be built for about 500# load. I'm going back and forth between a stand on or walk behind. Walk behind will take up less trailer space; stand on will still go top speed at the end of the day. Is anybody using a stand on and have issues with the maneuverability? I'm thinking the walk behind will have the maneuvering advantage. Anybody have some other words of wisdom for a power buggy construction project?