I broke down about a month ago and a Peterbilt wrecker towed me I asked the driver why do they put a pusher axle on the truck instead of making it a regular ten wheeler. The driver couldn't give me a straight answer. Keep in mind the truck was NOT a tri-axle, that I understand. The truck was a six wheeler with a pusher. Can anybody tell me the purpose of the puser axle on a heavy duty wrecker?