the lower leg 4 to the sleeve 3 thus the height of the platform 2 may be adjusted by selecting various openings 10 in sleeves 3 and legs 4 the end of the legs 4 opposite the end slid inside sleeve 3 is integrally secured to a bracing and supporting bar 9 as shown in fig1 the supporting bar 9 is essentially parallel to the platform 2 as best shown in fig3 a plurality of second sleeves 5 are attached to the middle bar 8 and extend transversely from the bottom portion of the middle bar 8 the middle bar 8 is integrally secured to the frame 1 and the platform 2 the second lower legs 6 slide inside the second sleeves 5 and are rigidly secured to the sleeves 5 by means of bolts 15 and wing nuts 13 a plurality of openings 11 are provided so that the second legs 6 may be slid in or out of sleeves 5 and the bolts 15 can be pushed through any number of openings 11 in sleeves 5 and legs 6 that are in line so that the lower legs 6 are secured rigidly to the sleeves 5 thus the middle portion of the platform 2 can be supported by adjusting the second plurality of legs 6 to a different height or the same height as the first plurality of legs 4 the end of the legs 6 opposite the end slid inside sleeves 5 are integrally secured to a bracing and supporting bar 7.