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No - different body style.
No, the B4000 is a rebadged Ford Ranger.
no, the tacoma bed is narrower than the ford.
no, Toyota and dodge are 2 completely different trucks
There are a bunch of different manufacturers of truck bed toppers or truck bed caps, as they are sometimes called. If you are looking for a new topper I've put a link in the related links for an info page that should help. If you're looking for a used topper I'd call the manufacturer of the kind of used topper you are interested in and ask them what other tacoma model/yr toppers are compatible with yours. It might take a little while and a couple of phone calls, but it's a lot easier than trying to retrofit a topper that doesn't fit your tacoma to begin with.
Toyota sells the Tacoma and Tundra pick up truck. The Tacoma starts at $15,000 and the Tundra starts at $23,000. The Tundra is a larger truck. The Toyota Tacoma, and Toyota Tundra are among the two new pickups this 2010 year. http://www.toyota.com/tacoma/
Yes, it should be a perfect fit.
Yes, they should fit.
yes
The Toyota Tacoma is a fairly popular pickup truck. The Tundra may be slightly more popular full-size truck.
If they both have the same length bed, yes it will fit.
Toyota tacoma or Toyota tundra