Hi Guys,
you make me chuckle.
I used to drag my kn5000 with me every weekend when we went to the holiday house. Used to repak it in it's cardboard carton & lift it into the back of hubby's Ford Utility ( I think you call them pickup trucks?) Then unload it at the other end.
( Hubby's a parapalegic , so he couldn't help)
Eventually I had the brains to buy a hard case for it. Made it heavier again, but easier to carry than in a cardboard box.
At that stage I was 5 foot 5inches weighing about 120lb.
Where there's a will, there's a way. I'd never let the weight of a keyboard determine whether I bought it or not.

best wishes
Rikki