This is actually happening - few years ago we were on one festival and met with a group who had 6 or 8 cabinets like that - BUT - as bonus they also had an emty amp-cabinet on top of each. They proudly demonstrated how each amp had the frontplates with pots and knobs - and as final touch - the power-switch was connected to 9V battery and LED - so right before the show was about to begin - one crew member walked on stage and marched past this row - stopping at each to "turn them on"
After the show they stuffed this and that inside those to make it all fit in their large bus - while we were travelling with a small van