The worst places I have been that needed it were level ground on the grass and I've been in one place after it had rained all night. I left ruts in the ground pulling the FW and a utility trailer. I was in a campground with old blacktop and dirt trying to back the FW up a slope and spun the tires in 2 wheel. If you are out in the desert a lot or just stay out of questionable grass areas you would probably do fine without it and maybe just air down. I've been in back woods sandy trails that I couldnt make it up in 4x4 until I aired down. I also carry a 120 volt air compressor mounted next to the Honda 3000 in front of the hitch so it's quick to air up.
The other time I like it is backing up a slope on my property where I put it in low range.