helped a guy back his 5er into a spot this weekend where he had to use 4x4, he just had to swing his front tires off the black top and was backing up hill, new ford f250 diesel.
If you know your limitations just stay within them.
I have had 4 2wd DRW diesels on my farm, all have been useless in the pasture, but I don't live in texas so I guess the pasture is better down there, where I live after the winter thaw you better just take the tractor in the field if you have a 4x4 or not.
we tend to camp in the mountains and 4x4 low range is really nice for some back in sites, if you stay only in concrete pull through sites you won't ever have a problem.