A thought:
There are a lot of presentations at Overland EXPO, what is the focus of YOUR presentation? For example, is your focus "Anyone can do it" or are you giving a presentation on your trip to South America?
If the former, then you probably don't want to spend time on South America specific issues or the details of your camper, but rather refer them to other presenters.
There will be overlap, of course, but a quick scan of the list of presentations will help you avoid train wrecks.
And I look forward to meeting you because I have really enjoyed you blog! :)
