Originally Posted by Kuba
For situations like that, especially that shore power is available, i carry two small 120v heaters
Running 2 Ceramic heaters on high will draw approx 25A. That plus the converter current will put you right at your limit. If you turn on any any additional appliances TV, microwave, heated bed, etc, you will trip a breaker if you have a 30A connection. . You can not count on running one of the heaters on the 15/20A outlet in the pedestal as in many parks, there is a 100A breaker up stream protecting 3 30A sites.