Whatever you do ww if it ain't too late, is not to let the customer see you are desperate. They will end up thinking they own you, instead of a bit of your time.
It's a windup turning up and not completing, but this is gonna be a long winter.
Better to drop them than get angry about them.
Having a side gate, the job can't be bigger than a semi and i'll bet it don't pay that well. 12 hours or so of brooding now will take years of cleaning to put this job back into profit.