When we were arranging our Russian Tourist visa in Ulaanbataar Mongolia, it also had to come with such an itinerary, in the invitation I believe. And this was an invitation coming from a company that I know and trust (even run by European).
I just gave a very basic itinerary. Of the places we would go (basically Baikal lake, and then towards Vladivostok). And we only gave names of hotels in big cities, not in between (which also cost several days). No reservation of the hotels were needed. (and this info goes into the invitation, in which case there would be no space for attachments of booking information).
But you need to plan the 30 days. So plan it before your car arrives, and it is very feasible to say you will be a week or so in Vladivostok, that should be fine. But don't mention the car if not needed. And then a rough itinerary towards Mongolia.
Once you get the visa you don't have to care about any of it.
However, at the embassy, they really read the invitation and mentioned the itinerary (without any problems, they just processed it)
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2011 Overland from Amsterdam to Nepal and back
2018 Overland from Amsterdam to Tokyo via Central Asia and Mongolia
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