I'm reminded of when I bought an upright player and with a few friends
rented a U-haul trailer to move it.  We got it in the trailer okay, but
not being a professional (anything at that point), when we arrived at
our destination the piano had wedged firmly between the two sides of
the truck.  If the truck had been wider, it would have fallen on its
back, but as it was it was stuck at an angle.

To solve this we took two car jacks and several blocks.  With the first
jack we raised it as much as we could, then we set up the second jack
with more blocks in the down position and raised it some more.
Eventually we had the piano right and we were able to proceed.

After that wonderful experience I always took a professional mover.

Eliyahu Shahar