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I wish they had bigger. But I have the 35 gallon tank and it was one of the options that I had to have. Only thing weird about it is that it comes probably 6 inches in front of the drivers side rear axle tube. Looks a little odd to me. You have to look for it, its not like it sticks out like a sore thumb.
On the crew, I think you have to have the 6.5 box to get it (I do). My dad has it on his 04 SCab with the 6.5 box.
Excellent option for when you are towing. You almost need a lawn chair if you are filling up from empty, people look at me funny when they role up, fill their vehicle, go in and pay, and come out and I'm still pumping, hahaha.
It was a "must" when I was looking for the right truck. I didn't want to be gassing up all the time when I was towing my travel trailer. We are heading to Vegas next month and I can't wait (about 900 miles one way). I will post results (mpg/performance/etc.)when I get back.