How about you let everyone know where you're meeting. Then I can bring my small but well prepared and trained group and take your stuff...

That is more likely what I would see happening. My group is made of up of 5 families who's males are all like minded and dedicated, 4 of which are related in some way. I have no question about the morals of the last family so they are also in the circle of trust. There is one slacker in our group, but he and his family could be brought up to speed quick.

If your group gets too big, or you don't have a deep understanding of how each person operates and a tie other than the situation at hand you will have distrust. It will be like some bad survival movie. Skip that idea. Look within the people you know and your relatives. Then try to organize them. If their are not into shooting or survival bases stuff, then offer to train them your self... Make sure you have a good base of knowledge first. Then get them focused on what they need.

A true SHTF situation will call for some strength in numbers. But the trust and bond must be there prior to the situation. Otherwise you'll end up with your throat cut in the middle of the night...