got sticker shock when i checked out the larger replacement tank for my 07 gmc sb 2500hd. now i'm trying to decide, NO GUESS what in bed setup works best. I know you guys will point me in the right direction. i need to stay below the access cover. like to be in the 20 gallon range.

thanks

Check for pics in my garage. I've got a 27 gal tank but you can always get a different tank.