WE JUST PULLED ONTO HIGWAY FROM CAMPGROUND STARTED TO SEE SMOKE AND SOMETHING FLEW OFF THAT CAUGHT MY EYE OFF OR THE REAR MOST AXEL ON THE DRIVERS SIDE. PULLED OVER ONCE IT WAS SAFE, DOWSED AXEL, RIM & TIRE WITH FIRE EXTINGUISHER. NO FIRE AT THIS TIME, BUT WAS VERY HOT & SMOKEY. HAD TO PULL OVER 4 MORE TIMES WITH IN 5 MILES TO DO THE SAME THING. MADE IT TO OUR HOME WHERE WE HOSED AXEL, RIM & TIRE UNTIL IT WAS COOL TO THE TOUCH. BACKED 5TH WHEEL INTO DRIVEWAY AND RIM SNAPPED COMPLETELY OFF OF AXEL. CONTACTED MANUFACTURE THAT EVENIN VIA E-MAIL. MANUFACTURE SAYS THEY ARE GETTING NEW AXEL & SHACKLES MADE, SHOULD BE SHIPPED TO US BY 7/14/17 TO REPLACE. GUESSING BARRING SIEZED AND LEAK AT REAR BACKING PLATE