I have an existing 120V 30A outlet used for an RV. I would like to make myself a breakout box to use this outlet as a bunch of regular outlets when I have the need for outdoor use. The outlet is wired with 10AWG copper.
I have seen existing products that are simply an adapter from an RV 30A plug to a NEMA 5-15R or 5-20R, but I'm concerned that these don't protect the thinner gauge wire used on the far end of the circuit. Also, the RV plug does not have a GFCI (I could not find a BR-type single-pole 30 amp GFCI or a standalone GFCI rated for 30 amps; also, according to my research, GFCI is not currently required for RV outlets) but I would want (need?) a GFCI when using regular outlets outdoors.
What is a safe way to break out this RV connector into two regular plugs with proper overcurrent and GFCI protection?
Additionally, would it be safe for me to put a 20 amp and a 15 amp split ( instead of two 15 amp) which would allow me to put a 20 amp receptacle, given that if the sum of the two goes over 30 amps, it will still be protected by the breaker in the panel?