Hey folks, quick question, 160hp 6.5 tonne tractor that will mostly spread slurry, small amount of ploughing (16" furrow) pull trailed silage harvester (trailer pulled behind) pull roller/press on ploughed ground, spread fertilizer in front of drill, act as backup to tractor on drill. This tractor won't do big hours possibly 200 hrs, currently only pulls harvester is an under-utilised older tractor that we need to get more from rather than spend money on a newer machine. It has 18"x38 and 14"x28rims. My options are as far as I understand are 580/70r38 or a 600/65r38 I have heard bad things about the 600's being poor on grassland work any experience?