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Problem solved! It was the thermal switch. I drained about 4 gallons of coolant and removed the 2 wires. Unbolted the old one and put in the new one. Temperature is holding under 180.
Thanks for all the input!

Thanks for the help! I'm all over these solutions!

Hi Brett. It's a 2000 38' Serengetti 3126b Alison tyranny.
I have ordered a new solenoid switch for the Bendix fan clutch. Hopefully this will work. I'll keep you updated.
Thanks! Greg

I am having a similar problem. Replaced the top overflow tank, water pump, thermostats new long life coolant and it's still overheating under load. Question. The fan air control switch seems to be disconnected by the previous owner. Why would he do this? Fuel economy? I'm focusing on the fan for now...

Steering box. I did the same as the last post. It seems the big o ring is the main culprit for leaking. I loosened the bolts. Fired it up and leaked fluid everywhere. L OL. Fairly easy job for an amateur like me!