If you want to be OCD about it, I would say 6 locations but if you dont... just 4 will do fine.
Here are the 6 locations I tied mine down (obviously they are under the vehicle and I do apologize for calling them hooks as my brain isnt working right now. They are steel U shaped that are welded into the frame):
Front passenger side hook
Rear driver side passenger side hook
Those two are the "extra/OCD" ones.
The usually ones are there:
Get yourself a harness for your tires that hold on to the tire from the 11 o'clock and 1 o'clock locations on all 4 tires so they push the tires down to the bed.
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