Our FW also has 50 amp service to provide for a 2nd AC and the washer/dryer hookup. Since we don't have or use these higher current appliances and depending on your own 50 Amp usage...This may help you too. We use this 30 amp RV Power Cord
that connects to the 50 Amp Marinco Locking Connector which I am asuming is what you have too.
The advantage is that even though the cord is still 25' long it is much lighter than the 50 amp counter part. Easier to store and use. Just remember...It WILL NOT provide 50 amps if that is needed.