@Maggie ********
I drive a Saleng, and have driven the second kind long distance, and unless you are an experienced sidecar driver, I really suggest you test drive the Saleng kind before you buy one. They are very hard work to drive and get harder the more weight you have in the sidecar, NEVER let go with both hands. If you have a heavy load in the sidecar make sure the centre of gravity is far enough forward to keep the front wheel on the ground, if the front gets light it will slide to the left, if the front wheel lifts and you are accelerating, you will immediately turn a very sharp left! When you brake it will want to turn right, when you accelerate it will want to turn left. That said, they are great fun once you get the hang of them.
The second kind (two wheel at the back) are a piece of cake to drive and have none of the issues above.