One other thing to keep in mind is that the burner in an RV oven is only about 1 1/2" below the bottom rack. On a residential oven it is nearly 6" below the bottom rack. That's why the perforated metal riser helps with the burning issue by putting more distance between the pan and the burner. Yes there are more btu's in a given amount of propane versus NG, but the oven thermostat should still regulate the heat so that while the flame may be "hotter" it still will only burn when necessary to maintain a given temperature.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.