How big of a rake for a 5x6 baler

Just curious how big of a rake are you guys running in front of your 5x6 balers in thick first cutting hay?

Right now I have a 10 wheel rake and that's all my massey 1837 square baler can handle in first cutting. If I start round baling and rebaling in the barn just wanted to get a idea if I could go to a 12,14,or 18 wheel rake when baling with a JD 569 or vermeer 605n.

How big of a rake for a 5x6 baler