I have two quick stories... in my first 1978 Scamp
13 (that I very foolishly towed with a '79 Jeep CJ-7), I was hooked up to a fresh water spigot in Lake Havasu
City near the (then) newly reconstructed London Bridge. We had invited some friends from Las Vegas to meet us there and we were having a great time.
My (now ex-) wife was standing in the trailer doing something or other in the middle of the afternoon when all of a sudden she began shrieking like a tornado siren. You could hear her for blocks, and you'd have thought someone was trying to kill her. My buddy and I sprang from our chairs and ran to the door to find the faucet feed line had come off the faucet from the pressure. It was flying around like a crazy snake, spraying my (now ex-) wife and the interior of the trailer with full pressure water. I got it shut off a the spigot, cleaned it up, and since we were in the desert in the summer, the trailer dried out quickly. It was a hilarious memory even today, but I'd shudder to think what the trailer would have looked like had we been away for a few hours when it pulled off. Something akin to an aquarium, no doubt...
The other was a hose that I had lying in the sun, again without a regulator (since the trailer had a residential pressure regulator inside). The hose swelled up like a python that had eaten a pig. My 5/8" hose got to be about 2 1/2" in diameter before I called it off and replaced the hose. It undoubtedly wouldn't have lasted much longer before it burst.
A $6 water regulator can save a lot of aggravation.