I think it's a fine idea, and I wouldn't worry about the concern that somehow a 15/20amp residential outlet on your RV pedestal is somehow 'wired' in such a way as to not be able to use it at the same time you use the 30amp outlet, that's not how electrical wiring works. But, I will say this, the breaker for the pedestal in the Main breaker panel will be the final determination of how many total amps that can be drawn from the pedestal. I seriously doubt that any electrician is trained to provide a main breaker that is less than 50amps for this scenario. If they did, they would be constantly getting request to come look at a pedestal because the coach has lost power, AND the pedestal has lost power... finding the need to either 'explain' a smaller main breaker, get onto the customer for 'using too much power', or to have to change the breaker then to the appropriate size.
I've also never seen any campground or rv park 'limit' the usage of any or all the outlets on a pedestal.... they are there to be used. I've used the residential outlet to power a heater for my wet bay in freezing temps, and also to power some additional fans for inside the coach during hot weather, and a lot of other scenarios that called for it, except for the campgrounds with ONLY a 30amp outlet, and NO residential additional one(yep, they're out there too).
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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