Kathy, there is a Janome trolly for the 400e, 500e, and 550e.  I think it is a new product.  I saw it on Ken's Sewing Center's website but may be sold elsewhere.

- Cat (FL)

"My peeve about moving my much-lighter and compact 500E, is that the embroidery arm is not removeable, so it sticks out 3-4 inches front and back at all times. And does not fit into any luggage I am aware of. .....AND it has no hard cover..."