How many of us are there? Owners of Dodge based RV's?

187 degrees is reasonable. At sea level, water boils at 212 degrees. As pressure decreases, such as at higher altitudes, the boiling point drops. Conversely, as pressure increases, such as in a pressurized coolant system with a 16 psi radiator cap, the boiling point rises. Most gasoline engine thermostats are fully open at 160-195 degrees.