Need some advise. I currently have 2000 F350 extended cab shortbed with single rear wheels. It has the PSD and is two wheel drive. Great truck, but i'm and looking for a truck with a dump bed or a flat that can be modified. I'm sick of digging mulch, soil, chippings, etc. out of the truck two - five times per week. I found an 02 F 450 PSD two wheel drive with 8 ro 9 foot flat bed. 22,000 miles. $24,000 Questions: What are the differences when you go to a F450? Payload, mileage, etc. Can a flat bed be converted to a dump bed? Is insurance more? Can you plow with this truck? (SWMissouri) only a couple good snows per season. Thanks for your feedback.