There are acouple of companys that make smaller spreaders that are wheel drive, but they are pricey. I've been wracking my brain and can;t remember the company names though. Look around for an older wheeldrive unit thats been replaced in useage by a big pto driven job. The horsey set use a lot of the smaller ones. If you have any dairys that have been around for years they may have one ofthe older units sitting out back gathering rust.
dun