Hi,
You probably could have upgraded to 50 amps in a few minutes more time than you have into this project.
One way that Weekend Warrior used to upgrade the trailers to 50 amps was a field installed 50 amp panel mounted in the garage area or a storage compartment. It would have one 30 amp breaker to feed the existing 30 amp main panel built into the RV, and more breakers for things like the A/C units and dedicated new 120 volt receptacles in the garage area for customer loads such as a air compressor or other things they desired.
It would be quick and easy to install a 50 amp power panel into a basement storage compartment, then run a new 50 amp cord from there to the park receptacle. Run a 30 amp line to the factory installed panel, and then transfer any loads that you desired to the new panel.
Anyway what you have done will work. But it might not comply with NEC regulations of only one power supply per vehicle.
Fred.