The Matthews Doorway Dolly is designed with a wheel base of 28.25" without an extended axle. Overall length reaches 51" with a platform size of 27.5" x 41.5". The two side boards add 10" each. Ground clearance is 9" or 3" when inverted. Load capacity is 800 lb.
 
https://www.bhphotovideo.com/c/product/135675-REG/Matthews_395100_Doorway_Dolly.html