Engine temps.

[04FX4]

Ok so when I tow my travel trailer, I have been monitoring my engine temps and CH temps on my gryphon. My CH temps are higher then the coolant temps by about 12 degrees. When on the flats I run about 200 and going up hills it will go up to about 216 on the coolant temps. I am concerned but was wondering what other have seen while towing. My gauge on the dash never goes above the half way mark which makes me think everything is normal but the gryphon has me thinking about it. My thermostat is a 195 and my trailers weight empty is about 4000lbs. Should I be worried or is this normal. I am going on a 2 week trip and dont want to have any problems on the way.