We have a covered morgue cart that the dead are transported in. But, we have a patient transport system, two people show up, identify the pt and take them down. If more help is needed, they pull from their staff.
I'm assuming you don't have patient transport... so before we had this... and I've been in your situation, we've called the house supervisor to watch our patients and brought a third nurse... if more were needed, and yes you sometimes need 4 people, the house supervisor temporarily allocated strong staff from other areas and only the primary nurse went down.
if our acuity was high, she would allocate the staff from other areas and leave us on the floor to catch up on our nursing duties. It only takes 20 minutes tops, so it was often easier to pull aides from one floor each to assist.