Bobbing My Bed

[Bjarker]

So I have a few questions, (I have searched and found numerous websites just want a little more reinsurance)
How much do I cut out to be able to fit a double cab soft topper on it.
I've read that 12-13 inches is normal. But a stock ext cab bed is 72 inches (6ft) and a stock double cab bed is 65 inches (5ft 5") so that's a difference of 7 inches. But all the websites I've read it says 13" will make it the same size as a double cab bed.

Just want to make sure I can fit a topper on it if I ever decide to put one on, before I start and

BTW these are the websites I'll most likely be using
http://www.atarmor.com/bedbob.htm
http://www.tacomaterritory.com/forum...ed#post2104727

thanks, Jon