E2 Fastaway manual;
"Integrated sway control on the e2 hitch works through the connection
between your spring arms and L-brackets. The force required by the hitch to
distribute weight rests on the L-brackets through the spring arms. The e2 hitch
takes advantage of the steel-on-steel friction generated at these points to help
reduce trailer sway."
"This added friction makes it much more difficult for the trailer to sway..."
"The contact points of the head and trunnion knuckles should be kept
clean and well lubricated with a good quality lubricant. They should be lubricated before each trip. Check for damage or abnormal wear at the beginning of each towing day and replace if necessary. Use a rag to clean dirt and road grit from all contact points regularly."
Noise:
"In some cases the friction on the L-brackets generate noise. This most
commonly occurs during slow, tight turns where the tow vehicle and trailer are
in a twist. This noise is normal and should be expected. It is an indication that there is friction on the L-bracket. Most of the noise will usually subside after a few uses as the hitch breaks in. Trailer and tow vehicle loading may also influence hitch noise."
"Lubricating the trunnion knuckle joints may help reduce this noise, and
is part of the required regular maintenance routine. Do Not lubricate the Lbracket joint. This will result in reduced friction, and reduced resistance to sway."