Bruce, I can tell you that I talked to Winnie on this one and they said "nothing is needed, but I could use 100% clear silicone (dry) spray on the aluminum slide channels". And they recommend just an occassional "dusting" of talcum powder on the rubber slide seals.
I bought some "silicone slide lube" in a spray can from Camping World and went to use it last month; yech! The stuff came out as a brownish liquid. Yes, it dried fast and was slippery, but I didn't like the brown/rusty color (had to wipe it all off the aluminum rail). -Maybe I got a bad can? So I lost $12 and pitched it in the trash. Have now successfully used 100% Silicone (clear) spray by Prestone available at local auto parts stores.
Last Brave 2004 34D