Quick question why is the ac sat on it's rear in the first photo.
Now I'm far from an expert on such things but surely if something which has a pivot point beneath it (the Hawk main wheels) goes through something which is anchored to the ground (the barrier) then the further the item with the pivot moves past the anchoring point the more likely it is that said pivioting item will tip in response to resistance from said anchoring point.
In other words, the barrier is pulling the Hawk onto its backside.