Me and a couple buddies of mine are doing a West coast to Midwest summer vacation tour in Aug for a month. I will be the only photographer. So far I have 5D2 and a 7d. My lens kit includes the 17-40 with a Manfrotto tripod and 4 Hitech GND filters for landscape, 70-200 f/4l IS for telephoto, Sigma 50 1.4 for portrait and low light, and the 15-85 for general hand held walkabout.
Is this sufficient enough for a months worth or do I need to add an additional lens or some extra accessories with it? I am thinking about getting a used 100-400L for the extra reach and a flash. We will be doing all type of activities from city/town touring, national parks, and scenic touring and sight seeing with our car.
I think I am pretty much set but would like to get some good advice from my fellow forum members.