I have a 2002 scamp
16" trailer and we get hot/warm water coming out of the cold water side sometimes.
First we have a hot water heater and always use it when we get to our camp spot.
Second the hot/warm water coming out is only for about the first 20 to 30 ounces.
Third in our scamp
the sink and thus cold supply line is right next to the hot water heater.
My guess is that the cold line is warming somehow either by being next to the hot water line or by traveling past the hot water heater. It does look like there is plywood under the water heater and that the cold water line travels under the plywood as it goes past the water heater.
So have any other Scamp
owners had a similar issue? I assume some simple pipe insulation could solve the problem, but just not sure where to put it.