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If it were me...
The cross bed box, a chest box essentially turns a 6' bed into a 4' bed... with a crossbed box, you can slide building materials underneath and take advantage of the full length of your bed (with most boxes at least) The best option IMO would be a low profile crossbed box (for a short bed)
I'd make sure the bolts to the floor were tight first.
I know the feeling, after going to the beach all four of my brand new shocks squeakthanks for the tips fellas. nothing ****** me off more than constant squeaking in a car