LR4 in the sand dunes?
 

The truck itself will do find in the sand but IMO sand is the hardest surface to navigate a 4wd on. The keys for success on sand are slow calculated movements of the throttle and at all costs avoid spinning your wheels. Airing down your tires will also help but take care not to pop a bead if you have 19 or 20 inch wheels. Equipment wise if i'm planning on sand I don't leave home without recovery boards and either a winch and sand anchor or a buddy to act as an anchor/ snatch strap puller. Snatch straps are great until you both bog your wheels, thats why a winch is invaluable.