4cyl 2.7 in the sand

I had a great time lowering the air pressure in my 265's and getting out on the sand dunes this last weekend. My friends v6 jeep would pull me on the hills, many of which I would get to the top, but not quite be able to crest. Any ideas on how to get more power for that extra oomph at the dunes? Or is it a lost cause.
Also if I lower my air in the tires at the dunes is it okay to run a few miles on at the low air pressure on asphalt to get to an air compressor?

 

Re-gear is an option. I would go slow and take it easy. Almost a limp because you might pop a bead or worse. I would look into a small portable air compressor.