Don't under estimate the additional weight of weighted 88 keys. Especially those with graded hammer Action and wood keys. Easily adds pounds to the weight. not to mention a road worthy chassis which is usually steel.

The wifes RD700 weighs 81 lbs!
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Yamaha Tyros 4
Yamaha Motif XS8
Roland RD700
Casio PX-330
Martin DC Aura
Breedlove ATlas Solo
Bose MOD II PA