Does anyone have a picture of an oxygen cart that is in use around a gliderport?

I am giving a speech TONIGHT (April 23) on glider oxygen systems and would like to include a picture of such. I want to emphasize the idea of the "low" pressure tank initial fill followed by the topping off from the "high" pressure tank.

If you can send the picture directly to me, that would be GREAT!

jhderosa + yahoo.com

Thanks much, John OHM Ω