I'm aware of lifting with the legs, not the back and trolley for horizontal
movement, rather than carrying. Any other advice assuming no human assistant
available ?
Travelling ceiling mounted block and tackle, swivable mounting frame on the
bench ? All little problem if the same amp enclosure each time but what
about universality of clamp arrangement or occassionally working on a heavy
and long 7 octave Yamaha piano and other odd shaped objects.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/