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Don't listen to some of the above comments, I do it all the time... You'll be fine.
Also keep note, two of the most expensive wedding photographers I know (who are booked a year in advance) primarily use ONE lens.. They may have more then one, but only use the one.
It really depends on your preferred FLs though. For me, 35+85 will give me what I need for most if not all weddings I shoot. Though in some cases I opt for 24, 50 and 105 macro, the weddings work out fine.
(when I use to shoot w/Canon it was 24L, 35L, 50L, 85L, 135L (never used) and I either used 24/50 or 35/85).
I shoot with two bodies simultaneously, and I usually try to bring 3 lenses with me at all times (though sometimes just two). But I do get details from the bride and groom ahead of time, so I know exactly what to expect. And if needed I have every FL one can imagine at home (which I suppose the same could be said for you, if there is a rental center near your place).
Sometimes I even leave the 24-70 in the car, with a SB-910 incase things get unexpectedly out of hand. Although again, I know all the wedding venues here in SG, as it's a small place, and I must have already shot 5 events at every hotel here.. Things usually don't get out of hand, and if I do use the 24-70 I usually delete most of the shots taken with it.
My suggestion to you... Put the 24 on the D800, and put the 105 on the D700, then get yourself a 50 1.8 on the cheap and switch off with your 105.. The 24 on a D800 can be cropped if you find yourself with to much information, whereas you may have issues cropping a 12mp D700 body..
Get a 50, you shouldn't have any trouble after that.