What type of axle - Underslung or Overslung? :: Trailer Sauce
Amazon.com: The Trailer Parts Outlet - 6 Leaf Heavy Duty Slipper Spring Suspension Kit - Complete Kit for 3" Tube, 7000 Pound Axles, Reliable Tandem Axle Suspension : Automotive
Amazon.com: Rockwell American Tandem 3,500 lb Electric Brakes Trailer Axles w/Springs, Ubolts & Hanger Kit (95" Hubface, 80" Spring Center) : Automotive