If you paid for hitch install with the Equalizer @ RVW, the ball will be included. I did it that way just because it was all new to me and didn't want to mess it up for the long journey home. Got the 1K/10K E4 and they put on an Equalizer brand 2" ball without me even asking. The ball has an 8,000-lb rating and has a longer than normal neck. Glad to hear you are getting your Roo back.
TV: '15 Ram 6.4 Hemi CC 4x4
Old TT: '12 Rockwood Roo 19 (sold)
New TT: '14 CR Sunset Trail 290QB
WD: Equalizer 1200/12K
BC: Ram OEM