You need a remote thermocouple unit. Even a brief door opening greatly alters oven temperature. They are not expensive,
even a unit designed to be used with a BBQ grill will work. Those may be purchased for <$50.
After I matched the oven temp knob with oven temperature, and placed 4 tile squares in the bottom of the oven, it baked very evenly and maintained a reasonably even temperature during baking time. My wife got so good at baking in the RV oven I gained 10# during our Alaska trip.
__________________
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA.
" My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy