I had the 50 Gal installed about a month ago. I have a 2019 3500 Megacab (short bed), so the factory tank was 31 Gal Just wasnt enough when towing my 5th wheel, as we sometimes drive 350 miles in a day, so that meant truck stops. New tank so far has been good, I got 580 miles when the light came on - took 42 Gal to refill. Thats all city driving, I will pull RV in a month, but I am excited about not having to stop. It gets stressful when needing fuel during a long trip and you don't know the area, and I am too big to use a gas station.
The gas gauge doesn't seem to move linear, but thats ok. My range calc is off (i expected that), so I will just use my trip computers. Knowing I have 8 Gal left on red is good to know, thats 80 miles towing until empty.
Overall I am very pleased I went and did this - just wish it would have been a factory option.