Do you let your TV warm up before towing?

just me wrote:
With all these suggestions and solutions being offered as to HOW an individual treats his diesel engine, it shows me that there is only a few that has read there owners manual.
First: a diesel engine will not warm up as a gas engine does by Idling. They are considered an air pump. Air in-air out. No baffle or butterfly in the throttle air inlet.
Second: by doing so, the motor oil will become diluted by unburned fuel making its way to the crank case. Not good for the engine. Ford says that 10% is ok.
Third: Start the engine, Bringing up the oil pressure and let it circulate for a minute to get the lube going, drive at a slow pace and moderately to bring the engine up to temp before driving normally with it. Your engine will get warmer faster while under load.
The older Ford Diesels injection pumps were crank case oil driven, an other reason that Ford recommended there oil additive to fortify the oil against oil break down.

Not an expert here, just relaying what I have gleamed over the years on how things work.
Its your engine do what you will, But I won't. High idle plus exhaust brake set will help. Newer ones will up-idle after a few minutes. Some have this set up in the ECM'S.
Check your OWNERS manual.