I highly suggest trying to find the pallet liners because while they're basically the thin 4 mil coroplast, they're industrial strength (so heavy items can be placed on pallets) so they don't require a lot of support. For each pallet liner section I only put a support at each end and one in the middle, overlapped the pallet liners about an inch over the supports, and just screwed them into the supports with self-tapping screws.
To me, they are the perfect size to use, because if something jumps up off the road and tears one up, I can easily replace just that section instead of spending all day under the car replacing the whole belly pan.
They've been on Turtle for almost a year now with no issues. You should be able to find them in your area.
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