Manuel, you may want to modify your R&R cart with a top shelf the way I did - it sure makes life easier and you can place the keyboard on the top shelf, then use the case for a work station while setting up your rig. I posted the instructions how to do this several months ago and lots of folks have benefited from this modification.
Gary

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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.)