I just purchased a 4 year old - 48" Giant-Vac walk behind w/ 15 hp Kawasaki. I looked through archives but didn't find much. I know they are now under the Briggs/Ferris/Snapper roof. But who actually made them 3 - 4 years ago, prior to the acquisition? Could someone give me a brief tutorial/history on the Giant-Vac walk behinds? What problems should I look for? Anyone have the service manuals? Thanks for any input.