Hey a question I can answer instead of ask!
If you have those stacking levelers, you can use then instead of buying something else. That's how we changed our tire the other day. It worked great.
The sheriff that stopped to help said he had built a ramp out of wood that he used with his trailer. (Two other passersby stopped to help and actually changed our tire for us. This is Texas, you don't need triple a, we are friendly) We were actually still waiting for triple a to call us back and the good Samaritan was all done. I hate triple a.
Here's a video to build one probably like the sheriff had
Liz