Bought a used Escalera (Sorry zmeny ). Practiced with it for a week before getting to use it for real. I practied on a footlocker filled with dumbbells and a piece of pool table slate. Lucked into a Paragon at a garage sale and brought it up two flights of stairs with a ninety degree turn. The owners were impressed to say the least.
I did have to stay on the concrete as I don't have the big wheels for off-roading yet. Hmmmm.... I wonder where the best place to purchase those would be.