If you want to use those saved HTML file to do some sort of presentation, I would simply make snapshots of them using the built in screen capture. Pressing home button and sleep button at the same time will take a snapshot of whatever is displayed on your iPad and save those in your album photo.
The benefit of doing so are:
1 - you make sure that nothing will go wrong while showing results to your customers
2 - if there is a playing video or any special html5 effects, you will have the result offline anyway
3 - using the images, you could create a presentation power point style... See app EasyShow
4 - the images can be reused over and over again
5 - you can insert annotation, highlights on you images
On the down side...
1 - no scrolling available or navigation
2 - takes a bit more space... Does that really matter?
I'm a big fan of Murphy's Law, and when it comes to customer presentation, experience showed me that the less interactive, the better
My 2 cents!
VicoPad addict!