Finding pushing my husband on anything but level ground rather hard work now I purchased a motor that clips underneath with battery pack which is very heavy and so has only partly solved the problem. Then saw this expensive model. The ypush wheelchair. I hope the link below works https://store.easylivingmobility.co.uk/shop/wheelchairs/powered-add-ons/ypush-wheelchair. Have any of you any experience of this model?