PREVIOUSLY REPORTED BY THE OWNER. I AM A METALLURGICAL ENGINEER INVESTIGATING THE FAILED COMPONENTS. BOTH REAR WHEELS CAME OFF OF THE TRUCK WHILE DRIVING ON A 2 LANE ROAD AT AN ESTIMATED SPEED OF 70 MPH. NO OTHER VEHICLE INVOLVED. DID NOT HIT A POT HOLE OR ANY OBJECT IN THE ROAD. AXLE APPEARS TO BE 1050 STEEL NORMALIZED AND INDUCTION HARDENED TO A DEPTH OF ABOUT 7/32 INCH. POSSIBLE FATIGUE. PART ID, DRIVERS SIDE, MFG. MW, CODE Y19 METAL STAMPED 23133, PASSENGER SIDE, MFG. MW, CODE Y70, METAL STAMPED 21142. OBTAINING INFORMATION ON A SIMILAR ACCIDENT WITH ANOTHER DODGE RAM 1500 MADE IN 1998.