Yeah state parks they run like 35 40 and that's if you're lucky. I've gotten as high as 45 but as soon as anybody uses the water that drops down.
As it goes now I pull up Park fill my fresh tank before I hook up the city water then when it's time to take a shower I run the sink with just City water to get the hot water heater running then I flip the switch for the water pump and I still have to set the water heater to a temperature between 100 and 111 and run only hot water for the shower to have a hot shower.
PS yes I know it's just a water heater not a hot water heater but old habits die hard