park water pressure

we just returned from a family reunion and when we checked in they told us to be sure to use a pressure regulator since the park had 110 lbs of pressure at the faucets. that's right 110 lbs and believe me they do. I have an adjustable and it worked great, son in laws has the other kind and it worked great also. BUT, a very ice top end motor home was parked across the road from us and when I looked over I saw a fountain of water about ten feet high. I went over and shut the water off and knocked on the door. no body home. when he came home I saw him standing by the faucet so I told him what happened and he said he had an internal pressure regulator and thought he didn't need another one. well it protected the internal pipes but not the hose. the next day he left and another young couple pulled in with a very new trailer. they left and left the water on and I was walking to my son in laws trailer when it sounded like a rifle shot. water sprayed across the street. they had no pressure regulator either. so we shut off the water as we did before, later that night when they got home we found out they only had the trailer for three days and was on their first trip. we sent them to wally world for parts and with some water education. nice young couple. felt so sorry they had to learn the hard way but sometimes that is the only way you learn good lessons. other than that we had a wonderful time visiting and being with the family