This is some information that I typed up for a fellow burner. He wants to bring his gear to the playa, but is concerned about damage. I typed this up, and thought it was pretty good info, so I'm posting it here.

Speakers: Bring some boxes/pallets/whatever and raise your speakers
off the ground. The best would be to have them at least 3 feet above
ground level. If you have speakers that go on poles, guy the
poles/speakers down so the wind doesn't eff with them (and it makes
them harder to wander off when they have a leash on them).

Amps: Build a rack that uses large 20"x20"x2" (or bigger) pleated
filters for the amps. Make sure the amps stay where they get airflow
and are out of the sun when you are using them.

Turntables: Cover them during a dust-storm and when they are not in
use. Obviously, keep them out of direct sun. There is really only
one thing that you'll need to worry about on-playa and that's the
pitch fader (only applies to high-quality tables like technic 1200s).
The motor won't suffer any problems at all. You really shouldn't even
have problems with that if you keep them covered as suggested above.
If you have cheap tables that are belt-driven, your belts could fail
on the playa as the dust could dry them out and make them slip.

Vinyl: Bring several high-quality kitchen garbage bags (the white
kind). When you are not actively using your records, wrap them in the
bag and tie it off (use a twist tie). Wrap them in several layers for
protection. Store them on the ground under your largest vehicle. If
you can keep them verticle, that's best for the vinyl, but laying them
on their side for the week shouldn't harm them as long as they are out
of direct sunlight at all times. If you have a silver-metal record
case, that should work instead of the garbage bags.

Mixer: That will have the most trouble. One modification that sounds
good to me is to take your top off of the mixer, custom cut a piece of
project felt to fit, and only cut slits and small holes for the knobs
and switches. Put it back together and see how everything works. If
something doesn't switch right like it's getting jammed up by the
felt, take it apart and take a tiny bit of felt off from there.
Re-assemble and try again. You may have to do this several times. Do
it slowly and carefully. Do not strip out any screws (threads or
heads). This felt will act as the filter for the top of your mixer.
If your mixer has an out-board power supply, you could probably use
felt to seal all the holes in the mixer case without problems. If the
power-supply is inside, you'll need to leave the holes open for
cooling.

Remember that *EVERYTHING* should be sealed/covered when not in use.
DO NOT leave your records out and open when you aren't using them.
They might wander off, and they'll certainly get covered with dust.

When you get back home, take the time to thoroughly clean
*EVERYTHING*. Don't just clean your records, but clean the sleeves
and cases. On your equipment, spend extra time on the things that
slide or twist. A good spraying of the table-motors with compressed
air should suffice there.

I've never DJed on the playa, but I *did* bring my mixer last year.
It literally sat unprotected on the open playa (in a milk-crate) all
week. It came home covered in dust. It then sat in my storage shed
until Februrary. I completely disassembled it (minus anything
requiring a soldering iron) and washed it in the sink. I sprayed it
down really well with some vinegar (acid to help neutralize the basic
playa) and then got it with dish soap and a scrubber (gently). I
rinsed it all out and let it dry for a day, then sprayed out the
faders with some good contact cleaner (with silicone lube). It dried
for another day before reassembly. The next day I plugged it in, and
everything worked fine, no scratchiness or anything. My mixer is a
cheap analog job. Digital ones might take a little more care.

My advice is just like the playa, read the back of the ticket before you go.