You would be OK if you replace the 30A socket on the camper with a 50A plug, continue to run to the existing converter off one leg and wire the second leg to a new 50A panel with appropriately sized wire. DO NOT change the 30A breaker in the existing converter to 50A... the existing wiring from the socket to that converter is only sized for 30A as is the bus inside the converter - you will melt/burn something. You could then move some circuits from your existing 30A panel to the new panel to balance the loads.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam