Living in London in the 50's, I remember two old soldiers, both with one leg. One was a window cleaner, and arrived with a push cart on which he had his ladder and buckets, and he climbed up and down that ladder at a fair rate of knots !
The other man sold muffins ... he also had a cart converted from a bike, with two wheels at the front, with the cart bit on, and one wheel at the back. How he cycled with just one leg, I have no idea ... unlike the window cleaner, he didnt have a wooden leg with a rubber on the end ! The muffins were hot and wrapped in clothes in the cart, and he'd deliver to your door, supported on crutches and carrying the basket on his head !