That's a tough one, Don. I'm comfortable with my 13 and 11 year olds, but E's a little younger. On the other hand, it's one you and one him - a very good ratio. Personally, I think that in your shoes I would talk to him about it - impress on him just how real the danger is if he is careless, but also what an amazing experience it is. If he's willing, and you're comfortable that he takes it seriously, then go for it! Of course, you know better just how reliable he is - whether he can be counted on to not horse around.
Wow, campground's full huh? FF - oh, yes, I'll be there. It's definitely a go this year.
Cher