Keep a few things in mind here as you contemplate a solution.
Gaps in the flooring may be great for draining but they will also allow road spray especially from the trailer tires to come up from the underside. Probably not ideal.
Those frames are designed to take the thickness of 3/4 inch plywood - standard dimensional lumber runs at 1.5" thick so it will protrude above the frame and be susceptible to damage as the edges will be exposed. Dimensional lumber especially PT stuff will warp, twist and split if not secured in enough places.
A good quality marine grade plywood deck properly treated should last the life of the trailer and really what it's designed to be build with. A solid sheet of plywood adds significant stiffness and structure to that frame that individual pieces of wood will not. I would think not using plywood may affect the overall trailer integrity and capacity.
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