I'm an Android guy....But all my family has sipped at the Cool Aid cup of iPhone. There are probably simpler ways...(I know I can share with one push of the button on the Galaxy S3).
But you sign on to the Forum with your phone's browser...Which I suppose you are doing any way to make these posts.....Then in the Safafi browser on the iPhone, post pics that you have
in your photo gallery (iPictures, Pictures, whatever) just like you do on your home computer.
Now, if you are posting from a laptop at night, just e-mail the pics to yourself from your phone when you shoot 'em, and post them to the Forum in the evening.
If you get to Denver or any place with a Verizon/ATT, or whatever your carrier is, and you have "keystroke issues", they'll be happy to line it out for you.
I, for one, would be most appreciative of flicks during the progress. No pressure. But some of us are stuck at home while you get to do this tasty trip!