We frequently get calls for elevated forklift mounted work platforms so the user can get an extra 4' or so of lift to perform maintenance tasks. These aren't commercially available because the don't meet the criteria laid out in ITSDF B56.1, according to a source at Ballymore (who manufactured them many years ago) paragraph 7.37.3 (b) "the floor of the platform located not more than 200 mm above the upper face of the supporting truck fork blade."