if set up is friction bar with tightening handle ,make sure the wd bars are greased where they go into the head .Plus the ball ,even the small ones on the sway ,have grease on them. When you get into the campground you can just loosen the sway bar handle a bit as it is not needed going slow, this will stop all noise .
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper
It sounds normal, but it would help to see the setup. If you have the bars with chains then the bars should be parallel with the frame & to the ground with both trailer & truck as level as possible, which takes a bit of trial/error to get setup properly. I seen some that had the bars at almost a 45 degree angle sticking up & grinding against the frame, that makes an awful noise. That's the only type of WD hitch I'm familiar with so if some other type I can't help.