I sew leather purses which can get heavy. I stopped at Ralph's a local industrial sewing shop in Denver. They have all types of machines with walking foot. I saw new and used machines and tried many of them. I bought a Kingmax GC0302 which sewed all my materials. They make many different models you might want to check them out. Kingmax website is
www.kingmax.us.com and i would call and talk to Jack he will help you with your questions. Ralphs website is
www.powersew.com. They help me alot! Its not just buying a machine its the support and all the attachments to make my products better. Make sure you get with servo motor its a must! Good Luck