I would be more worried about the iPad causing a problem than WiFi.
Most, of the WiFi problems can be solved into a "best case" working condition through using high quality equipment, redundancy, and spending time at each location setting it up so that it's as isolated as possible.
The iPad is still, more or less, experimental in that the biggest complaints about it are the same as the iPhone and similar devices - it doesn't always work as expected. It can freeze up for no reason, battery
power isn't always the greatest thing in the world to rely on, and it is a delicate device.
Overall, I think it could work, but I do not think of it as the best solution. I think it would take a lot of testing before you would want to take it on the
road. And because, in my experience, these devices are so unpredictable, it could work flawlessly every time.
EDIT: Just after I posted this, without doing anything else, Tapaltalk/iPhone quit on its own. Unpredictable, I say, great, but unpredictable. Perfect example of why I'd worry more about the device than the
network.