Daggo could probly help you more than I-but
Depends on what tires you're running and whether you can "Deflate" or not and how far you'll have to drive and do you have an aux cooler installed and do you have an air compressor and do you have a shovel and --see it ain't simple-
Here's my jeep climbing a sand hill, in 4hi,but I've got everything required and you should bein 4lo, if you haven't got an aux cooler !
Or get some of these-
Ain't jeepin fun-?