Been there done that, many times. I was just on the playa New Years Day getting a quad off from several miles out (close to the point). Having lived in Empire, your best equipment is going to be WATER and SHOES (walk barefoot on wet playa and put the dry shoes on when you get to the train tracks - save you from wet shoe blisters

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Something can and usually does go bad when you're "out". Doesn't matter what you drive or what you bring. Being prepared will get you out of a lot of situations but prepare for the worst. Much better to have two vehicles for many reasons.
I don't drive automatic because the starter is a single point of stuck. 2 gas tanks because most gas stations out back only get gas once a week and it's not uncommon to have to wait (or hit up a local ranch -- that may only carry diesel). 2 spare tires, otherwise you have to cut short a trip after one flat (always expect 1, 2 just pisses you off especially when they happen at the same time, and a lot of playa was/is used as bombing range with plenty of sharp "artifacts" so be wary in bare feet.) I carry a dead-man, that was made for a quad and it works well SO LONG AS YOU DON"T BURY THE TIRES. You can let some air out to help float, but that also really seems to speed up the mud compaction.
If you bury the tires in the mud, you will need serious help!!! I cannot express that enough. As soon as you feel the lug, see the temp rise or hear the mud up underneath, veer out to drier areas. Don't stop on wet ground if you can help it. Momentum is priceless. You can use levelers like the links mentioned above but I've not had much luck with them.
One product I would like to see in action (as opposed to eager to try because I hate cleaning playa or it's associated insta-rust) is the air bag that you hook up to your exhaust and slide it under the axle. Seems like it would do much better thanks to Archimedes Principle than the hi-lift. Less weight to carry too.
When on the playa, especially moist, weight makes a difference. Here the lighter J*#p may be a better option. I ponder whether a hi-lift is even a good idea on the playa because the weight/benefit ration is very low.
If you have California plates, nobody is going to stop to help you either. Just say'in...