I didnt even think about wheelchair parts and motors. You could totally build a frame to hold the couch and attach wheel chair motors and wheels to it and control it with a controller board just like my remote control lawnmower build. Lawntoy 2.4Ghz
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The only way to accomplish this would be to fabricate something yourself and it would require some very beefy robotic type expensive electronics. At least I'm not aware of anything prebuilt that would work.