alright I grew up farming peanuts and looking back we started single row 38in, then twin 38, then 30in rows, some people having great success with twin 30s.
Why not plant on 20 inch rows. The only drawback would be inverting. For that issue you could take a 6 row 40in digger and put an exra shank frog blades and lifters right in the middle of the other ones on every row essentially making a 12r 20in peanut digger.
Might require skinny tires on one tractor to plant and invert but man they would shade so quickly and its not like you skimp controlling disease with popular row spacing anyway.
Oh how nice it would be to set the tractors out to 80in settings instead of 60. Then for rotation just plant your cotton on 40in spacing and corn and beans run on 20 like the peanuts.