The toter can idea is pretty decent, but with a few adjustments this could work even better.
First, the capacity isn’t there… this is why he’s only hitting 90 degrees. Although I don’t know how many days it’s been since he added materials, I can say that it won’t get too much hotter than where it is.
This is due to not enough volume and not enough airflow.
Toter should reduce the size of the collection chamber on the bottom and aerate the side panels. If this could have over 55 gallons of capacity up top, I would recommend it.