My local welding supply has several photos of what an exploding oxygen tank can do to a car. They are typically at 2,000psi. The entire rear of the car was gone and oxygen is not explosive. A tank strong enough to be safe and big enough to be practical would weigh 500lbs.
The setup at the Ford dealership adds about 500 lbs to the truck. Its EPA certified but the safety of the tanks is a concern anytime your putting its contents under high pressure. Safety note taken and I appreciate it.
I’m only researching it at this point. Not sold on it as of yet due to not trusting the state and our friends in the gubmint to keep the price low. I’ve seen Utah in the $1.60 to $1.80 gge range and Texas has been at $2.84 per gge so the spread is all over the place. It may work in some areas; not in others.