Only the correct size ball will work.
Well, yes and no. Several years ago I stopped to see if an older gent needed help. He was parked near a trailered sea-doo. Turns out he was using a too small ball. To make it worse he didn't bother to hitch the chains. He was lucky as nothing serious happened, it rode along the road then into the soft shoulder.
Against my advice (and another person who stopped) he left with it once again ... on the too small ball - BUT with the chains crossed tightly. I went the other way.
2008 Jayco Eagle SuperLite 29.5
2014 F250 6.7 PSD 4X4, CC LB