We've got a 2001 Dodge Ram 1500 Extra Cab. There's the stock carpeting, but we use the truck for work outside and track in a lot of mud.
On my Luv I put in a full cover vinyl mat, that covers the entire floor.
I looked on JC Whitney and they sell 2 seprate mats that cover the whole width but you use one up front and one in front of the rear.
The sperate mats are nice to be able to take in and out, but I also like the idea of covering the full floor.
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1980 Luv 4x4 with a 5 speed tranny.
"When all else fails, follow the directions".