I can tell you from experience what I have done. I like to go camping on the beach, the sand is as soft as sugar ,although I have 4wd dually I was interested on how far I could go before bogging down. I aired down to 20 lbs front and 40 lbs rear . Now bear in mind I have a full size loaded 11 ft Lance camper. I took off in 2wd and drove 3 miles with out getting bogged down. I was even able to drive over some rises in the sand and able to turn 180 degrees to park. I know it would be a hugh effort to put a couple of grand in the back of your truck , but I would not be with out 4wd in any vehicle I ever own. Everyone has their own preferences, but like other I have gotten stuck on wet grass with the dually, with out the 4wd I would have needed a tug. Best of luck