2016 Lance 1685 trailer coupler ball size?

THanks everyone for their replies. Dealer finally got back to me late today and confirmed that it is in fact 2 5/16".

My 2015 1685 uses a 2 5/16" ball. I believe only the single axle Lances use a 2" ball.

Order the WD hitch without the ball.

Call the dealer and get the ball size in the morning. Buy the ball locally after you have received your WD hitch so you also know the correct shank size and length. Some WD hitches take longer length shanks than others.

That trailer grosses at 5500 lb, a 2" ball is more than adequate.I would be surprised if it uses the larger one but they are inexpensive.