Most modern furnaces use a direct spark ignition. I am surprised you have a pilot light at all in a 2015 model trailer.
Anyway, you need to determine if the main burning is being lit. Often you can see/hear it if you get down by the furnace. Furnaces have a sail switch which must be closed by the flow of air from the fan. Then they have a flame sense that will detect if the main burner is lit. They also have an overtemp limit sensor that will determine if the furnace is too hot. If any of these are not working properly, your furnace will not light.
But first! Check you battery voltage, maybe it is low if you are not plugged into shore power. Also, check/clean all electrical connections to the furnace.
2015 Jayco 27RLS
2015 Ford F250 6.7PSD