The case I use is plywood reinforced, very light, no wheels, and I put my keyboard stand, fan and speaker extensions on top of it while transporting on the rock and roller cart. Now, that plywood is just 1/8th inch thick and would not support a lot of weight, but it will protect the keyboard from damage if someone were to inadvertently bang into the case with something. I'm not sure if a tyros will fit into this case, though.

http://www.amazon.com/Guardian-CK-010-61-Featherweight-Keyboard-Case/dp/B006BL8V44

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)