I’ve looked all over eBay, and there’s lots of sellers, but how do I know who to go with? How do I know the quality of the tank (if it’s banged around a lot) if the pictures are generic from a ‘batch’ they have? And finally, what’s the oldest tank it’s worth buying? I know DOT is a must, recent hydro test is needed, but is a 2005 tank (technically expired) worth getting? Or should I spend more money on a tank that’s still in serviceable?