Deere doesn't like implement steering with a tow between tank.

On my setup, I have active implement guidance on my JD 9560rt with the hydraulic hitch.  I have a "wheel angle" sensor mounted to the hitch.  My implement receiver is mounted on over the front bar on my air drill which is behind my 800 bu tow-between tank.  My distance setting is 25' behind the tractor, (also doesn't recognize pulling a Bourgault drill/tank).  The implement controller swings the hitch to make the drill follow directly behind the tractor, when auto-steer is engaged.

Guidance works well enough that I don't overlap on most of my land (some hilly land, it just can't compensate for).

Hope this helps.