RDMueller wrote:
Many different ways to do this. One option is to use Andersen levelers. Because of the design, the wheel is basically in a cradle once the 2nd piece is put in place. No way for the wheel to roll either direction. Essentially levelers and chocks all in one.

The primary purpose of these is for leveling. They work much better if your tire rolls up to the mid point of the large ramp which gives you about a 2" lift for leveling. That way the small chock fits fully under the large ramp as shown in the picture.
If you need smaller or larger lift for leveling such as 1" or 3", your tire will be much closer to one end or the other of the large ramp. When you end up like this, the slightest movement of you trailer can cause your tire to roll off either end of the large ramp.
The only solution to avoid this is to keep repositioning your trailer and the large ramp until you end up with your trailer level and with the bottom of your tire near the mid point of the large ramp. Of course this is more work and eliminates the advantage that Anderson claims to have in this design.
I have a pair of these in my trailer and don't find them near as great as all the Anderson videos show.