I hope I'm barking up the right tree

I have a friend that towed a Lance 1985 with the identical truck. The Lance has GVWR of 5700# however I do not know what his actual tow numbers were. His truck had some kind of package on it as his tires were oversized and the truck displayed some extra graphics. He did have an auto transmission. He used an equalizer hitch and reported to me that he was very pleased with the truck's towing performance.

He ended up selling the trailer and truck as he wanted to upsize but the quality and function of his equipment wasn't an issue. Good luck with your search.