The ammonia hydrogen EATS (corrodes) the piping from the inside. It's similar to what happens to an exhaust pipe on an old car.
It would take "The Hose Clamp Of The Century", a long breaker bar, adapters and a weightlifter to have any chance at all of denting a good pipe.
Yet I can take a screwdriver and run next door and with two fingers jab it deep into my neighbor's badly corroded muffler.
RV refrigerator piping is too thin brand new. They have to make it that way for weight. The piping on an old Servel house LPG refrigerator is three times as thick, the refrigerator is stunningly heavy and yes the piping lasts much longer.
"The tire shop just put air in my tire and now the valve stem failed (cracks) so I am going to go back and ask for a new free valve stem".
Sorry about the expense. You should read my history of comments about just how far hurling a gas refrigerator is "far enough". Gas refrigerators are expensive, work poorly, unreliable, and I will never buy another.
The earliest Servels from Europe had nickel chromium alloy steel tubes. The Swedes didn't go through all that trouble for nothing.
Best of Fortune to you. the expense really hurts...