Truckworld Display suggestion (almost a dare)Why not set up two identical reefers in the parking lot and let them run the whole event, one with the Hydragen, and one without.
Run them from translucent fuel containers where the difference in fuel consumption would be there for all to see.
Even better yet, have a smog sensor up the tailpipe of each unit to show off the emissions.
This sales technique seems to be a no brainer to me.
Cheers