How much a trailer is going to be able to push / bounce around / porpus your tow vehicle is going to depend on your trailer weight / length versus your tow vehicle weight / length. A weight distributing hitch will help control this to some extent and a Hensley is a premium WD hitch.
If you tow your 39' tail hitch toyhauler with a Prius it isn't going to handle well no matter how much you spend on a hitch. I tow my 26' trailer with my crew cab long box 2500 Duramax. I hardly know it is back there. I consider my Duramax overkill for my trailer... but I like it that way!