Our 2016 Rockwood came with a ladder mounted bike rack. I would say it's probably the same that the Windjammer will come with. It's not the best rack out there but it certain got the job done for 2 kids bikes. I still put my wife's and my bikes in the back of the truck.
I never liked the idea of blocking the ladder with bikes incase I had to get on the roof with the bikes mounted. So, I went with this set up.
All I had to do is move the spare tire over to one side and mount the receiver. I just got back from a 600 mile trip with no issues with 2 Adult bikes on the back. Also, unless you are going to mount your bikes vertical, you will have part of your bikes extending past the side of your camper if you hang from the ladder. Beware of trees and other objects hitting your bikes.
The ladder bike rack shown in the picture above, has been used by myself for years. This is the best bike rack on the market. It mounts in seconds and is removed just as fast. I have used mine for over 8 years with no problems. I have had people at campgrounds all over ask where to get one. You can find them on Amazon and EBay. I bought mine years ago on EBay.