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big ticket
For a major expense like your RV rental, you'll really need to get quotes. This is the sort of thing where you can get hard numbers, so you won't need to start guessing estimates.
With $30 a day per person, you've got a lot of money to work with, and you should certainly be able to fit drinks within that.
For gas costs, you can use the fuel cost calculator on the left side of the screen. Remember, you'll probably drive at least 20% farther than your point to point distances from a computer program, and I'd be surprised if you get more than 10 mpg with the RVs, but that will depend on the models.
A national parks pass will cost $80 and cover everyone inside a single vehicle for admission fees (camping and other extras are not included) for an entire year. If National Parks are a large portion of your trip, then you are being very generous there.
Of course, its always better to budget too much, than not enough!
