I also have the Weathertech liners and think they are great. I went with the gray color in my khaki interior, looks a little better than the beige (tried both, long story). As far as flaps, I went with the molded OEM and they seem to do a good job and not too big.
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2008 RAM 2500, MC, 6.7 Auto, 4x4, Laramie, Inferno Red