Can't speak specifically for the 1100, but this is on the 900's.
If your engine isn't running and you want to lift the hydraulic bed:
In the aforementioned picture/diagram, take the lever #10 and jam it all the way forward. It should lock in the forward (float) position. If it doesn't, try harder. Once it's locked in that forward position, all hydraulics are bypassed through some magic and you can then lift the bed. Once you raise it, hold it up then place the holding rod as mentioned in post #4. You can then return lever #10 to it's neutral position or leave it locked forward to lower the bed then put it in neutral position.