I'm having problems understanding what makes some trailers to sway. The 21 FB Bigfoot sways at 60mph. I always make sure that the fresh water tank is full of water and the front storage compartment is loaded with heavy stuff. On the other hand I pull a light aluminum Thule enclosed trailer and never swayed whther it was loaded or not. The Thule trailer is about 3 feet shorter.
I did install a swaybar for the Bigfoot 21 FB and it improves the towing. I noticed the swaybar lets out some noises when raining. I usually reduce the friction a little bit.
I'm still puzzled what makes the trailers sway. Have a Trailite Vision 30 ft trailer and that one sways as well!
Larry, You don't mention what your tow vehicle is so I'm just taking a guess on this but, I'm assuming that your Bigfoot
has tandem axles, if your loaded up so you have 10% to 15% of your load on your tow vehicle then your axles may be out of alignment with each other. A telltale sign of that might be unusual tire wear