In 2000 I had a new 01 GMC 2500 van with Quigley 4x4 conversion. Bought a travel trailer, my first. 5.7 Vortec was rated about 8000 tow rating, subtract 300 for 4x4. Traoler GTW was 6000.
The salesman assured me I needed no load equalizers or sway control.
I hated it! The truck was lifted to allow room for oil pan & differential, that might have made it worse. I added load equalizer, it helped with porpoising, but cross winds were a real problem with sway.
First summer we went to Bar Harbor, On Route 2 in ME it was miserable! Every bridge, every tractor trailer would start a growing sway. I spotted a small sign on a lawn looked like a private residence, TRAILER HITCHES INSTALLED. I stopped. Guy said he could help. 20 minutes later I had a friction sway control. What a difference!