I've put well over 45,000 miles pulling my 12,500 lb GVW PJ Flatbed Cargo Trailer attached to my Reese P/N 45008 Class-V Tow Beast Receiver Hitch with a 2-1/2" Square Receiver, cross-country most of the time fully loaded in the last 4 years from sea level to over 10,000' on major highways to dirt and gravel county roads and I don't experience all that jerking and bucking. Of all my 4 trailers that I presently own my 12,500 lb GVW PJ Flatbed Cargo Trailer, properly loaded, is one of the best tag-alongs that I've ever owned. And yes, I've owned and pulled GN, 5th Wheel, and Rear Hitch in my over 55 years of licensed driving.
To each his own!
Jim