What kind of insulation is "Maximum Fill"?

It does have the thermal package. After we got the trailer home from Idaho we had all kinds of electrical problems. We discovered that squirrels got into the bottom level and chewed all the wires. Brake wires and tank sensor level wires....pretty much everything. I removed the corrugated plastic and all the fiberglass insulation from underneath. I had to drop all the holding tanks to replace & repair all the sensors in the tanks and replace all the 12V wires. This meant cutting all the drains and vents too. For some reason the squirrels didn't touch any of the 120V wiring. When I got it all back together I hired a guy to spray foam the entire underside with closed cell polyurethane foam insulation. I put in the Horst Miracle Probe sensors into the tanks and I have to say they work much better than the button style original ones. The electrical all works 100% now as do the tank level sensors. The floor is so much warmer with the spray foam instead of the water soaked fiberglass that was in there from the factory. It's also much quieter inside the trailer with the spray foam. There are no cavities for squirrels or mice to get into now, as it's all sealed with spray foam.