Chunking/fore and aft jerking can a problem with any size truck ....even a DRW pulling a small 10k 5th wheel/GN trailer. BTDT with more than one rig.
There is no single thing that causes chunking in all truck/trailer combinations as there are probably a couple of dozen things that can cause it....however there may be one thing causing any truck/trailer chunking issue.
Finding it can be a big headache and frustrating although many find relief in a air ride pin box.
And some folks think what worked for them is the answer to all others chunking issues.
Don't let the weight police scare you as anytime a poster mentions he has a 250/2500 truck we hear the same old tired "get a bigger truck" nonsense. A bigger truck may or may not be the answer.
Good luck and enjoy the rig