Figured out my mild overheating problem from yesterday. Apparently I had a very slow weep that let the coolant out over time, but only while driving.
Never a drop on the driveway but the sway bar was slimy with coolant where it was blown down by the fan.
No time like the present for the post-GovPlanet-auction coolant flush and thermostat replacement, so I took care of that and also made sure the offending hose clamp was tight. No leaks, truck seems to run about 10 degrees cooler.
Ambient temperature got close to 60F today. I took a 45 minute test drive with lots of poking along, stops and hard accelerations and almost couldn't get the engine hot enough to engage the fan. It finally came on as I was pulling into the driveway. It ran very briefly and the cool down effect seemed much improved.
and... I spent two HOURS with a fin comb straightening out the oil cooler/trans cooler fins and I'm still not done. The fins were smashed flat, like Shrek was working on this truck. I also blew air between the layers of the cooling stack to clear out any lodged leaves and gunk.
Lastly, I have the troop seats in position and I'll install the mounting hardware tomorrow morning.