shaking

I RECENTLY ADDED A BED CAMPER TO MY OVERLAND BUILD AND HAVEN'T EXPERIENCED ANY ISSUES DRIVING UNTIL ABOUT 2 MONTHS LATER. THE JEEP STARTS TO SWAY/ROCK LEFT TO RIGHT ONCE I REACH SPEEDS OF 55+ MPH, IF I CONTINUE AT THAT SPEED THE SWAY/ROCKING GETS SO BAD THAT THE FRONT LEFT/RIGHT TIRE WILL...