The one big draw-back on going to the 50AMP SERVICE connection to eliminate the use of TWO shore power cables is extreme care has to be made on how it is wired up. The 50AMP service can give you 240AC inside you trailer unless you follow the RV WIRING Scheme.
This simple diagram shows the RV Wiring scheme for having two separate 120VAC Power panels.
The problem is some camp grounds only have 30AMP and 20AMP service requiring you to use an adapter. If you add the proper adapter then you are back to having the same problem of running out of 30AMP SERVICE. The 30AMP Service is split between the two Power Panels..
Photos from DMBRUSS
For the few times I run into this problem I found just connecting to the available 20AMP Service connection on the pedestal for the few high wattage appliances was sufficient for us. In my case it only cost the extra HD 20AMP Extension Cord which I already had for connecting my shore power cable to a 15AMP Receptacle at my home garage setup...
More food for thought
Roy Ken