Do you have a tractor and no rear attachments whatsoever? Just put something on the back.
But barring the limited details, there are too many variables to answer this question...
We dont know if the tires are loaded
We dont know if you are using bucket and strapping the safe
OR if you have clamp on pallet forks
OR if you have actual quick attach forks
OR if the area is even level where this lift needs to take place.
But, do you have any implements for the rear of the tractor at all? If so, why even question it. Put something on. There is ZERO harm having something on the back while unloading. But how are things gonna go and whats it gonna cost if your tractor WONT lift it, and you have to take the time to then attach something, or worst case, have to reschedule a delivery?