You might want to post this question on the RV HVAC and Appliances forum under the RV Systems and Technologies folder over on iRV2.com. There are several certified RV techs who frequent that forum that could probably give you the best answers to your question.
If you're experiencing food burning on the bottom in your RV's oven, that seems to be the nature of the beast. In every one we've owned, you have to lower the temperature and extend the cooking time from that called for in the recipe for food to turn out right.
Rusty