Combines 4wd or large rear tiresIJIJ or bothIJ

I run 710_70R42 duals with 7psi of air on the front of my 9750's and the 28lx26 with 12psi of air on the rears without rear wheel drive and it is the best ride I've ever had on a combine and reduces compaction by far from the 20.8R42 I use to run. I feel like thoughs front tires will pull my combine through anything. I live in central Iowa and most of the ground I farm is flat with little hills.

How does the combine steer with the large rear tireIJ and will it turn as sharpIJ Thanks Ps we put 1050x38 on the front

The big tires on the back r nice but i don't think you'll get full value out of them if you don't have four wheel drive. We always run our 9500's and 9650sts combine with the four wheel drive ON. Its alot easier on the final drives. We have 650_65_R38's on our machine, and luv them.