If it's any help, I've had to replace both pigtails on our TT. One leaked during a trip a couple of years ago, and the other hose was suspect as it had taken a set to the way it was flexed. Mine leaked near the fitting that screws into the regulator. A little soapy water showed the hose itself was leaking, not the connection at the regulator.
The fittings on the hose were crimped, so no fixing them at the campground. Fortunately, there was a Camping World about 5 miles away.
If you replace one, go ahead and replace both. Same age, likely to fail too. I did keep the one working hose as a spare... just in case.