Thanks to everyone who responded on the list and privately. It looks like the consensus is for LPS-2 on the rod-ends for the controls/flaps and grease for the landing gear rod-ends. I'll be sure check out the other suggestions: Finish Line Wet Lube Chain Lubricant and the Tri-Flow with PTFE as well.  I note that the Tri-Flow is the only one of all the lubricants mentioned here that advertises it is good down to -60º. That's a real plus in my book.

FWIW, I consider my "redneck freezer test" with the Boeshield T-9 to be a qualified success. I lubed a rod-end with the T-9, placed it in a baggie, and then stuck it in the kitchen freezer at +15º degrees overnight. This morning I pulled out the rod-end and the movement was still completely free with no sign of sluggishness. I guess I should try the test again in our chest freezer at -10º to be more confident.

To further muddy the waters, I see that Lubriplate makes a calcium-based Low Temperature Grease good from -60º to +250ºF and a lithium-based Lubriplate Aero good from -70º to +350ºF. Apparently these were designed for lubricating garage door screw drives and gears.

Thanks again for all the advice.

--John