The problem is that the piano is really too small if only it transported in a van, but it's too large for car. I’m not sure that someone you know has a trunk of the right size, but you can try to find
piano movers services or use the baggage loading service at a moving company. Many customers don't mind sharing the relocation service if you have a similar route. This can save money for you and them, but the relocation company will not work at a loss. Try looking for such options for transporting the piano on the Wisemove portal.