Each side has an independent motor. I still don't see how being imbalanced would be a problem. Essentially, if you are sitting on one side as opposed to the other would make it more unbalanced than just taking a bench off. Not sure what the bench weighs.. Maybe 50 to 75 lbs? My guess is I think you should be good. You could always take off both sides and get a Layzboy!!! I would take one side off. Measure each side and run it up and down once and remeasure. If all is good, roll on.
2015 XLR Nitro 30FQSL
2015 F250 King Ranch