The mobile cart, convertible to a canopy shelter, scissor member rectilinear expandable side frameworks having closed, fully open and intermediate modes. A canopy framework of extendable canopy struts. A central hub pivotally connected to upper strut ends. Vertically extendable legs having corner joints pivotally connected to lower strut ends and to adjacent side scissor frameworks. Each leg has a wheel. A fabric canopy cover on the expanded side framework when the struts form a pitched frame. Struts have a substantially closed, vertical stand mode when telescopically collapsed. Struts have a cart-floor mode at an intermediate length when legs are intermediate height, forming an open top wheeled cart. Fully collapsed, canopy cover is interstitial vertical standing struts and collapsed side frameworks. Method from compact form, extending frameworks and struts first to intermediate rectilinear position for the cart-mode; then lifting hub, extending struts while extending the frameworks to a canopy deployed position.