We've had our MH two years this year. My problem is my feet aren't that big - size 8.5. When driving to get the best leverage on the accelerator my foot is halfway up or at the top of the pedal. This ...
Boots don't do it for me. They don't add anywhere near enough height/length. And a block of wood worries me -- it might wedge itself into the wrong place in an emergency.
I put a pillow or something under my right knee, on the edge of the seat. This is not a complete solution, but it does assist in holding my leg up in the air, so it's not all muscle work.