Pre-Ride check list

Check your OHV           (should be preformed prior to departure)

General service              (all needed repairs are complete)
Fuel level                        (main tank & spare gas can if needed)
Tire pressure                  (check that your tires are at the pressure you like)
Emergency supplies       (first-aid, tools, spare-tire/repair-kit, jack, etc)
Radio/check                   (ride leader will provide frequency & do radio check)

Prepare Yourself
Buckle your seat belt     (roll bars can protect you if your body stays in the rig)

Spray Bottle with water  (can be used to cool off and also clean windshield or wounds)
Wear a helmet               (required for anyone under 18)
Wear a mask                 (dust is common, so protect your lungs)
Sunscreen                     (light-weight hats, gloves, long sleeves, long pants)
Clothing                         (layer clothing for temperatures changes)
Hydration                       (drink plenty of water frequently)
Medications                   (bring medications you may need)
Health issues                 (any special health issues, advise the leaders)
Wet-wipes                      (tissues, rags, etc) 

During the ride
Follow the leaders instructions                     (with regard to turns) 

Ride with your lights on                                (helps to identify members of the group)
Follow the rig in front                                    (at a safe distance)

Keep an eye on the SxS behind you            (if you don't see their lights slow/stop until you do)

Stay with the group                                       (the desert is a big place to search)

If you don't see any vehicles stop and wait  (we will come back for you)
Stay on designated trails                              (this will protect the environment)
Stay to the right on hills/curves                     (slow down if limited visibility)
Uphill traffic has the right of way                   (remember slow down and back up)
Don't pass other riders                                  (it can throw rocks & dirt on them)
Slow down for hiker/campers/bicycles          (keep the dust down)
Watch for critters                                           (snakes, scorpions, etc)
Stop for horse riders to pass                         (& turn off SxS to not spook the horse)

Use hand signals to oncoming vehicles indicating the number of riders behind you.