The truck is low mileage (95K kilometers). The leak is very low volume. It drops on the floor more or less under the engine block. When fresh, it is odorless with a yellow shade. When dry on the floor, it appears white. I am guessing it is antifreeze. I can't see any obvious hose clamp leaks, etc.
When looking through other posts about leaks, I came across a comment from Ron D. that said:

Common coolant leak point on the 4.0l OHV engine is the intake manifold where it joins the head.
Aluminum intake and cast iron heads causes electrolysis so can eat away at the gasket and aluminum.

If Ron D. sees this post, I am wondering if the leak he spoke of above could leak to the outside of the engine and drip on the floor?

 

The answer to your question is yes, if the coolant port gasket material has blown out or deteriorated causing a coolant leak, it can be a big enough leak to puddle up below the engine. Especially if it is the front left port that blows. RonD is correct about electrolysis and dissimilar metals.

 

Thanks for reply. I am going to look again in the area you noted. Corrosion of the aluminum manifold itself is a scary($$) thought.

 

It may help to get a uv dye for the coolant and a good uv light to inspect where the leak's point of origin is coming from.