ok thx for saying it was custom made, i saw the pic while i was browsing and was like, in the original fic twilight's mom was in a wheelchair and kkat described it like a human wheelchair, i was majorly confused.
Wrong. Sentry bot rides in spheares. There is no any bots on wheels in Fallout 1-3 or FoE. Well...maybe there is one in New Vegas(I didn't play it, something wrong with sound) but it had only one wheel(saw it in intro).
Wrong. Sentry bots ride on spherical wheels (distinct hub and tire), and this is what she is equipped with. As I said, it will be clearer when I draw the front on image. I referenced the FO3 art while drawing this!