Orchard ladder is a tripod, and the single leg that opposes the steps allows you to place that leg directly into the shrubs, allowing you to usually get closer than a stepladder. Also the leg has no fixed position (no stop, like a stepladder), so it is taboo to use this ladder on any surface other than earth. The leg is designed to sink into the soil an inch or 2, to stabilize the leg. If used on hard surfaces, there is nothing to stop the leg from just sliding out from under you. An OSHA inspector would get a thrill seeing an orchard ladder on a hard surface - citation time.
Orchard ladders come up to 16', and the safe standing height is usually about 4' from top, so you have stability. So you need to figure the height you want. There are only 2 or 3 main manufacturers. Ought to be able to find them with a Google, and contact them for a dealer near you. Don't know if he's still around, but someone used to make one with a telescoping leg, so you could easily use the ladder on a hill.