How can I best utilize my truck in order to earn a few bucks?

I have a 2001 GMC Savanna 3500 with a 16 foot box, with roll up rear door. Changes in business have made this truck idle, but it is in very good shape and I wish to keep it around.... however, it would be nice if it helped out a little...If you owned this truck, what would you do with it in order to make a few bucks ?Any good ideas or experiances you are willing to share ? Thanks...