[PARAPTOR]

Without further information I am not sure who is correct, ie, if that tech verified that the circuit previously protected by that 15 Amp breaker was actually wired with #12 gauge wire the the devices on that circuit are rated for 20 Amps then he was correct about increasing that breaker to 20 Amps. On the other hand if that circuit was wired with #14 wire and/or contains devices rated at 15 Amps, it is not correct to protect that circuit with a 20 AMP breaker.

I am not aware of any difference in breakers for and RV versus those used in a stick house. If you are hours away and you conclude that 20/20 breaker is incorrect, I would unplug that breaker and take it to the store for a correct replacement .

Keep in mind that breaker is sized to protect circuit wiring and devices on that circuit. you watching not over load it is only one part, you also have to consider a device failure.

Update: I guess we have a few of us typing at the same time