Mega hope for Mega-E

Where can I get advice about feeding a dog diagnosed with megaesophagus? I have seen a video on Facebook where a a dog ‘stands’ on his back legs in a sort of three-sided box, flips a tray on a hinge across the front of the box, and the owner places the food bowl on the tray so he can eat comfortably. ( https://www.facebook.com/photo.php?v=10200229585371258&set=vb.1501248026&type=2&theater)

Are these chairs available in the UK or are they home made? I would love to know how owners have trained their dogs to eat in this way.