Here is a picture of my stack of boards I carry in the TT. They are all stored inside an auxiliary step box I made. You can also buy plastic "Legos" for the same purpose. But I like wood better.
A couple thicker boards for when a lot of leveling is needed. Some thinner plywood boards for a little leveling, and I use them under my stabilizers to increase the surface area on soft ground. In the box is also a couple of step board for leveling picnic tables and I store my hatch in there as it seams to be a safer place.
I also have a separate board I use under the tongue, but I store it in the TV when traveling. I have never used the tongue wheel that came with the TT.