I have a 2011 700 XTX and I've had the belt squeal on me at times. The advice that I got, was anytime I'm climbing or doing anything that requires any significant amount of torque, place the transmission in low. Were you pulling something out of the ditch or were your tires spinning? Were you stuck? Again, anytime you need torque, put the trans in low. From my experience, when I do this, I don't get the belt squeal like I do when I'm in high. I hope this works for you!
2011 Prowler 700 XTX
2.5 inch Stateline Customs lift
1.5 inch wheel spacers