I have the K2 products harp dolly with the extended loading board, and the six wheels on each side. It has sheepskin to protect your harp on the wooden handle bars. It is so sturdy and well made. I don’t have any problems loading any of my harps on it as it is very secrure. The straps are well located and easy to adjust. I have used it to move concert grandes, my Camac Clio and Prelude without any problem at all. The K2 fits them very well. It did not fit my Lyrica though. Although it won’t turn on a dime, it is super on stairs! That was why I bought it plus the reccomendations from other harpers that I know. I can’t remember exactly what I paid for it, but it was a very wise investment. I will never complain about it’s cost.