I have a Rollz Motion 2.0 Rollator, it is the only Walker that converts to a seat or a wheelchair. It is made in the Netherlands and sells for $1349 new. It is solid, comfortable, incredibly smooth and easy to maneuver. It folds easily to put in a trunk. It weighs about 30 pounds and is Island Blue. It was used a few times but looks brand new. I have the box and all the accessories. It is the 21.5 inch height. I put the specs below. You can get more information on the Rollz website...shop.rollz.com/product/rollz-motion-2/.
I am happy to answer questions or send additional photos.
I may be able to deliver in the the Bay Area or meet you somewhere convenient.
Rollator walker weight: 25.55 lb.
Wheelchair package weight: 7.5 lb.
Maximum weight capacity: 275 lb.
User height: 5 ft 3 in – 6 ft 3 in (regular)
Seat height: 21 ½"
Handle height range: 34 -39" (regular)
Seat size rollator walker: 7.9 x 17 ¾"
Seat size wheelchair: 16 ½ x 17 ¾"
Overall width: 26 ½"
Overall depth: 24 ¾"
Width folded: 12 ¼"
Front wheel diameter: 8"
Rear wheel diameter: 12