2008 NISSAN PATHFINDER Steering Problems

WHENEVER I'M DRIVING ON THE HIGHWAY GOING ABOUT 65 MPH AND HIT A BUMP MY TRUCK WILL ROCK VIOLENTLY BACK AND FORTH. THIS IS VERY DANGEROUS. ALSO, THE BACK END OF TRUCK IS VERY WOBBLY IF I DRIVE OVER A HUMP. I'M AFRAID THAT THE TRUCK IS GOING TO ROLLOVER.

A) THE SERVICE LIGHT COMES ON FOR THE EVAP SYSTEM. TOOK TO NISSAN AND THEY INITIALLY SAID IT WASN'T ANYTHING THEN IT TURNED INTO A CPU BEING BAD (AFTER 3 TRIPS) NOW THE LIGHT IS ON AGAIN AND IT'S AN EVAP CODE AGAIN FOR THE CHARCOAL VENT SYSTEM. I'VE LOOKED IT UP AND THIS IS A KNOWN ISSUE AND WAS EVEN RECALLED ON THE XTERRA. THE ISSUE BEING THE LOCATION OF THE CHARCOAL FILTER. B) THE STEERING BOX VIBRATES OR CAUSES A SEVERE STEERING WHEEL VIBRATION

WHERE DO I BEGIN WITH WITH PROBLEMS THAT I HAVE HAD WITH THIS VEHICLE? I PURCHASED THE VEHICLE IN 2010 WITH 48,000 MILES ON IT. LOOKED BRAND NEW, NOW, I THINK I KNOW WHAT THEY TRADED IT IN. I HAVE HAD ONE PROBLEM AFTER ANOTHER. I HAVE SPENT OVER $7000 IN THE PAST YEAR AND A HALF, OUTSIDE OF NORMAL UPKEEP LIKE TIRES AND BRAKES, ON REPAIRS FOR THIS VEHICLE. I AM A SINGLE MOTHER WITH 2 SMALL CHILDREN! MY HUSBAND WAS KILLED IN 2014. DO YOU KNOW HOW HARD IT'S BEEN FOR ME TO GET ALL THIS DONE?!?! BUT I HAD TO, IT'S PAID OFF AND I DON'T WANT A NEW CAR NOTE! REPLACING A TRANSMISSION THAT THE COMPANY I FEEL KNOWS IS FAULTY IS REALLY UNJUST. I INITIALLY PAID $1800 TO GET IT FIXED FOR IT ONLY TO CONTINUE MESSING UP AGAIN. I WAS TOLD THEM THEY PROBABLY...