I used to use a welded rack 30mm angle iron. I had four 6 inches 180 mm I suppose pumped wheels £25 each. It was 4 tier (wedding cake inspired!!!!) Top was old corg x300 next was corg 01wfd next corg sgid piano.Last was three powered mixers. Two of us hauled it everywhere but up stairs events we needed four people to lift. When I went back on my own I changed back to the long haul. I do miss it though. Arrive at gig and in 10 minutes we had take of.