2015 Dodge Grand Caravan Tires & Wheels Problems

I can't unscrew 4 lug nuts on my rear wheel. I was able to remove just one bought extra tool try to remove them all. Material is like butter, not steel. How engineering could let material like that to be used. I found on the web that a dealer wonna $400 to remove that lugs....

KUMHO SOLUS KH16 TIRES CAME ON MY NEW 2015 DODGE CARAVAN. ONLY 21000 MILES LATER, 3 OF THE 4 TIRES HAD PIECES OF TREAD CHUCKING OFF. TWO OF THE TIRES APPEAR TO HAVE SPLITTING IN THE RIM AREA AS IF THE CASING IS SEPARATING. I WAS 220 MILES FROM HOME ON CHRISTMAS VACATION WHEN I HAD ALL FOUR TIRES REPLACED. MY EXTENDED FAMILY HAS 2 CARAVANS WITH THE SAME KUMHO TIRES AND ALL SHOW THE SAME ISSUES. THE TIRE DEALER NOTED THE TIRES WERE MANUFACTURED IN 2014 (P225/65 R17 H100, CAB502C, 0261971, 011341SW). AFTER READING OTHER TIRE REVIEWS IT APPEARS THERE ARE MANY SAFETY AND WEAR ISSUES WITH THIS TIRE BRAND. I COULD NOT LOCATE AN AUTHORIZED KUMHO DEALER IN THE AMELIA ISLAND AREA THE DAY AFTER CHRISTMAS BUT DID NOT CARE AS I WOULD NEVER HAVE THIS BRAND ON ANY CAR I OWNED AFTER THIS EXPERIENCE. REALLY, HOW CAN THIS TIRE BE SOLD AT ALL?

IN THE ACT OF TURNING INTO A PARKING LOT, I HIT THE CURB ON THE FRONT PASSENGER SIDE AND HEARD A LOUD BANG. AS I CONTINUED, I KNEW IMMEDIATELY THAT I HAD A FLAT AND PULLED INTO A PARKING SPOT. THERE WAS A SIDE WALL BLOW OUT VERY LARGE ON THAT FRONT TIRE. HAD TO REPLACE THE TIRE ON A CAR THAT WE HAVE OWNED NEW FOR ONLY 6 MONTHS AND ONLY HAD 6,000 MILES ON. I WAS GOING VERY SLOW AS I TURNED AND WHEN I WENT BACK TO LOOK AT THE CURB IT WAS ROUNDED AND NOT SHARP. TOOK A PHOTO OF IT BECAUSE IT SHOCKED ME. AAA CAME AND TOWED THE CAR TO A DEALER AND AFTER READING SOME SHOCKING REPORTS ABOUT THE TAKAHOMA TIRES THAT WE HAVE ON OUR CAR DECIDED TO REPLACE IT WITH ANOTHER BRAND. MY CONCERN IS THE SAFETY OF THE OTHER 3 TIRES AS WE CONTINUE DRIVING THIS CAR.