As far as the  swing arm-
do you have enough water?   a lot of people  with  wells  around here  replaced their  first water drives with the new fangled swing arm models  in the 70's-80's.  
Most were disappointed  their well capacity  wasn't quite enough to cover those  extra acres.   Some added a second well to get enough.   At the end of the season,  total field bushels really didn't change,  even with the additional  8-10 acres.

There are very few left now.    There's probably  1 or 2  swing towers parked in the corners  every mile.
They blew over fairly easy in storms,  and even though they had  multiple  redundant  safety systems, a lot of them  found new and creative ways to tie themselves in a knot.  

I have a  2003 Valley corner system   and  everytime  I hear what a new one will cost,   puts me further on the side of the fence  to go back to a standard 7 tower  when the time comes.  
GPS  managed ones   seem to have most of the bugs worked out these days,  and may be a little less prone for disaster..  but dang,  it takes a computer wiz  to  diagnose issues.   

in my soils,  and water quantity,   I'm  not seeing a real  cost benefit to having it on the place.   If I had better subsoils/ more water,   it probably pay for itself eventually.   

you talk about deep ruts,  which tells me you have  decent soils.  This  alone  could be a plus for considering one.  Next would be  how much water can you get?   I'll take a wild  swing here-  a minimum of 1000 gpm  should  do a good job on a swinger.  
I'm closer to  about 850gpm,   and  on  100* days,  and the wind is howling,  I go backwards quickly,  but the same gpm wells  running a  standard length one  just keep up if nothing breaks down. 

when the swinger breaks down during those conditions,  I'm screwed for catching up again. 

speaking of ruts,  yeah,  there are  better tires/wheels  out there that do better than others.   About every couple of years, someone comes out with a 'better mousetrap'  for this issue.   I've had irrigated  alfalfa that started out perfect,  but  eventually pounded out  ruts on my  heavier soils.    By then,  I'll purposely   mow and rake  'around the circle'  to avoid  crossing ruts..  It can get quite interesting to get a  baler up out of the track  without tearing something up/making the rut a lot  worse.
elimate ruts?  no,  but  some wheel designs  will  sure  slow the inevitable down.