I have a John Deere 694AN planter that is in good shape with the larger boxes that I would like to hang on to but if I can't make it work for me it may have to go down the road for a 7000. FIL bought 4 double disk fertilize openers for it and a set of boxes off of a 4 row wide. I'm looking for the smaller boxes and two more openers for fertilizer. With fertilize openers should I try to find a set of DD openers to go on the row unit it's self? Also are there any other tricks I need to know to get it to work for me instead of fighting it all spring. Looking to plant corn and beans with it next spring.