Just bought a Pioneer 500 in Colorado for our small ranch property. Was crazy trying to find one that wasn't already sold! Now looking for a heavy duty (preferably not-metal) rear dump box with ability to lift/dump like the 520 model. Let me know if anyone has an idea. Seeing plenty of nice options but none with a lift/dump capability that I've found. Am fairly strong with mechanics if someone has done one before and can share some details.