In that kinda situation when you need more traction as long as you aren't going far or fast, air the tires down until they start to bulge a little, easiest done by pulling the valve core and just watching, if you have a gauge 15psi would put you way ahead of street pressure... if you're in a real pinch as long as you aren't going crazy you could go down to like 8, a total game changer in some situations... with 35's in sand and snow it's not too uncommon for me to go down to 6-8psi, usually a little higher in front than in back in case something hard gets bumped while steering.
On the tire note, I tried to put my new to me set of 225 75 15's on the Ranger and realized they aren't Ranger wheels like they look like... They're neutral backspacing so I thought they might be, and the pattern looked like the stock Ranger steelies... but they look like 5 on 5 or 5.5 unfortunately... I did get the Kelly Safari 31's on deer hoof wheels on my Explorer though, it got rid of most of my tire related noise and vibration! It's much less annoying to drive down the road now! Plus now it's only sporting two Jeep wheels unless you count the spare which is Jeep too...