Hello,
Thank you fopr chimming in, I was given your information by the developer of "Pianolift".
That tool saved the day of a friend that rent about 12 grand pianos , and had a heart problem, with the doctors saying he'd better avoid the kind of effort as putting the pianos on their side...
As many others he used the "pianoplan" (the base trolley used for the piano-lift) but this mean some manipulations to screw some sort of metal framing to balance the grand in a vertical position and put the pianoplan under it. - for the less heavy grands, the piano is just put on a corner on the trolley and then raised vertically
I will send the links to the few videos I find again.
Best regards