we could sidedress 20" rows with 3ph 40' bar on 380 tractor rubber ok.  have switched to moving those row's out too 22" on 120" C/L with sprayer and Y drops.  sprayer run's 320/125/54 and I have to steer.  Its actually better than tractor for sprayer blight. 

I'm not convinced you need full tram line's vs wider rows.

our new planter will get pushed out to 23/24" row's on 120" C/L