auxiliary fuel tank

i have a '00 Z71 5.3L (gasoline) Chevy and would like to install an auxiliary fuel tank in the bed (short box) of the truck. can anyone recommend a good unit and one that is not $1K? here are a couple that i am
looking at.
<http://www.northerntool.com/webapp/wcs/stores/servlet/ProductDisplay?storeIdi70&productId 0306747&R 0306747>
http://transferflow.com/html/crossthebedtanks_0.html
http://attatank.com /
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what's wrong with the first unit for $379? That's not $1000.
Don't think you'll do much better than $379. But what's wrong with just putting a fuel cell inside of a normal truck toolbox?
Regardless of your approach, make SURE you ground the tank very well.
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