I just ordered one of these. I also bought the gravity feed install kit for the Chevy. I will have 86 gallons which should take me 1500 miles unloaded and over 1100 miles towing the boat. I looked at this brand in the store and they look really well made.

http://www.northerntool.com/webapp/w...ormics&afsrc=1

I'm glad you posted Northern's website. I was about to look for it.

I made one myself last winter. I've got a hard folding bed cover on my F350, so I use the bed cover as the cover for the top tool box. I can hold 85 extra gallons of fuel and either transfer it to something else with a transfer pump or flip a switch in the cab and pull out of the spare tank into the fuel system.

This my quest also....and since I have an added 31 gal fuel tank to my full size van........I have been in search of a larger tank for the 04 Chevy 2500HD. Now there are 2 manufactures that I have found over the years, but the problem with the newer (gas) vehicles is the OBD II system. Have you tried Transfer Flow out of CA? They have a system now being tested for the OBD II and should be ready soon.
http://www.transferflow.com/

Another company is http://www.nwmp.com/ But they do not seem to be interested in the newer update systems

And another.....http://www.aerotanks.com/tanks.html

That's about all I could find that really care and do anything with fuels.....with the EPA and DER rules, it makes it really hard.
No more manual switching unless you do it yourself, everything has to electronic and tested under government
rules

Keep us updated on your quest

JB

PS..Sorry for the repeats....I didn't read the entire thread until after I posted...But hope it helps

Thanks guys for all the info. The Transfer flow is approx. $1,250 installed for a 48 gal tank and the Aerotank's is $1,100 installed. These are replacement tanks for the original. Yes, my truck is a diesel also.
I have decided on the replacement tank because my truck has a 6" lift. I couldn't reach into the bed to re-fuel the tank without the hassle of climbing into the bed first.

The one one that Northern tool had is plumbed into your fuel system. You simply flip a switch in the cab. Even makes your stock fuel gauge read the aux tank. I have an aditional transfer pump on mine.
You would have to get up into the bed to fill it though.

Well it says 44 gal on the tag but I have put 47 in and had room. There is an in tank mod that allows the extra to go in and lets you fill faster, the last 5 gal takes about 10 min but with the mod it takes 1. Go thedieselstop.com and look up the in tank mod. You have to drop the tank but when empty it is not bad, the skid plate was the worst part.