One thing I will point out..
There are 3 outlets you might consider
Standard 15/20 amp House type outlet withour without GFCI. This is acceptable for keeping batteries charged and fridge cool. That's about the limit of this circuit.
TT-30.. I recommend AGAINST, though if it is properly installed it is a good choice.
50 amp RV outlet: What I personally recommend, Even if you short feed it with a 30 amp breaker set..
Here is why.
Many many times we read where someone had a TT-30 installed and the electrician looked at and said 'OH, 240 volts" and the poor RVer pops all his expensive electronics, TV, Microwave, Converter, sometimes even fridge, water heater and air conditioner(s).
Even read a few where the RV owner did his own wiring that way (I installed a TT-30.. The RIGHT way but then I was using an existing 120 volt line).
With a 50 amp outlet (Which is 120/240 volt) this is never a problem, the odds the installer will do it right is never 100%, but .. Well, it's as close as you can get. I have never read of a home 50 amp outlet being done wrong.
(Have heard of a few parks that took a shortcut)
Home is where I park it!