If i put any kind of weight in back it will rock side to side...changed everything that can be changed...steering wheel does not shake or move just the whole truck rocks side to side

What is your question?

If any weight is in back at about 40 mph it starts to rock side to side if you dont tap brake to slow down it really gets to rocking ...a hole in road a bump makes it rock...at times it gets really scary...ive had 100 trucks and ive never ever had or seen one do this

What makes this problem better or worse?

Weight in back like 2 bags of 50lb cement...hitting a bump or hole in road

How long has your 2011 Ram 1500 had this problem?

3 to 4 years when we got truck