agesilaus wrote:
From the e2 manual:
"The contact points of the head and spring bars, as well as the hitch ball, should be kept clean and well lubricated with a good quality bearing grease. See Figure 27. They should be cleaned and lubricated before each trip. Check for damage or abnormal wear at the beginning of each tow and replace parts if necessary. Use a rag to clean dirt and road grit from all contact points regularly"
This is in reference to the front end of the spring bars where they attach next to the ball and pivot while turning.
Further down in the manual:
If after lubricating the hitch you still experience some noise do not be alarmed. This is generally caused by the friction between the spring arms and L-brackets, which means that your e2 hitch is working as it should to help control sway.
They also recommend disconnecting the bars in the OPs situation:
Do not tow your trailer on rough roads. Do not tow your trailer through profound round ditches, dips, or swales. Excessive strain on the spring arms and hitch head may cause hitch fatigue or failure.