LOOKED ON LINE AND LOOKED A PREMADE FRAMES BUT NOTHING SUITED MY NEEDS FOR BEEFINESS. DECIDED TO BUILD MY OWN. STARTED OUT WITH A JIG MADE OUT OF TWO SHEETS OF 1/2 OSB ATTACHED TOGETHER. DID FRAME LAYOUT AND USED IT TO MOCK UP CUT METAL. I USED 2X2" .120 SQUARE TUBING I GOT FROM LOCAL METAL SUPPLIER FOR $.50 A POUND. NEXT I ORDERED MY AXLE. AFTER REVIEWING POST ON SEVERAL WEB SITES AND TALKING TO SOME PEOPLE I WENT WITH A 3500# LB AXLE AND LEAFS