Yes. The beauty of DC is that there aren't any phasing issues to worry about like AC. So, both the tow vehicle and the power converter will be powering the camper without problems. In fact the power converter will 'see' the other source and adjust accordingly.
Now this would be problematic if the scenario were different - using AC. For instance you wouldn't want to use the 120V system from two sources (say a pedestal and a genny) simultaneously. That would cause problems.
2013 Sunset Trail 31BH