What size plywood & screws are needed to re-deck my ramp and trailer?

FLOE uses #12-14 1 3/4" long square drive self tapping screws to secure 5/8"  treated plywood to the deck.  The ramp uses 1/2" treated plywood.  There are 49 screws used on a 10' trailer. There are also 5 3/16" x 1" rivets used to secure the back channel.  FLOE uses CCA treated plywood. You can also use MCQ but do not use ACQ as there is a chemical in it that corrodes aluminum. Instructions for re-decking your trailer can be found at www.floeintl.com under instructions and manuals.