heelo my navara used to slide every were even in the dry (slight heavy right foot) needed new tyres so i put cooper st discovers on they have a softer compound than bfg all terrains so they grip better still and now it only slids if i boot it round corners or flick it about hard.
the best thing to do is to not accelerate until pointing in a straight line. they have alot of power at the back and it forces the tyre to slip good fun when you want it slid though and if it does slip just eas off and slightly coorect the steering and it will come back fine.