Wheel Help

OK, I am going to run a 19 in wheels in the front of my ranger and I am debating whether I can run a 20 in in the rear because these are the only sizes available. This is for a bagged 95 Ranger.

19x8 (+30 offset)19x8 (+40 offset)20x8 (+50 offset)

I am curious if the +50 is going to be too high an offset to run in the rear. Will I have room between the frame and the tire? Also, would I be able to run a link bar on the outside of my frame

I would think 42mm or even a 45mm would tuck sweet...

I need all the help I can get. I just need to know if that backspacing is too high for the 20 in. in a +50. If I have to I can run a 1/4 in. spacer to bring it out a little. I know the +50 will tuck, I am just curious how much room on the backside that will leave me.