Well, I ended up pulling out the seats, carpet, and insulation pad. The driver's side insulation was soaked. There was some water standing in the door sill area as well as in the cab corner area. I dried that up and then sprayed water all over the windshield and cowl area. No sign of any water leaking in
Then the next night it rained (still had the carpet out of the truck). The next morning there was a small amount of water at
both rear cab corner areas. (My driveway has a slight incline so that explains why the water was pooling in the rear corners.) I couldn't see any sign of water leaking in near the driver's side kick panel. Of course that could have easily dried up after the rain had stoped. I guess I'll just keep an eye on it, maybe take it up to the car wash and look for signs of soapy water.