I use a combination of stackable leveling blocks, nature and airing down tires. At the beach or in soft dirt/sand I use my lockers in front wheel drive then rear wheel drive to dig my self down, a fresh martini, beer or wine in a glass works great as a field level. And of course, make sure you backfill any holes before leaving.
I plan to install independently controlled airbags on all four corners this summer. This is primarily for better control while towing, but will give me 0-12" of leveling capability.
2007 E350 RB50 Sportsmoble, Always longwinded and misspelled.