Funny, when I was looking at RV's I looked at a lot with 50amp power. lol

 

It should work a 50 amp rv, but you will have to watch the load carefully so you don’t pass that 30 amp mark.

guy at rv place told me occasionally they get an rv’er who burned his 30 amp camper up after wiring his plug at 240v.

 

What a waste. 30 amp service not wired for a 30TT Receptical.
For those unfamiliar, RV 50 amps systems are actually TWO seperate 50amp hot lines making 100 amps total into the RV. The 30 amp RV systems use a single hot 120 circuit.
I’d like to see the wiring diagram for that power supply. Mostly to see if the two duplex 20 amp outlets are fed separately or are all ganged together.

 

L14-30 is rated at 30A at 240V... two 120V hot leads 180 degrees out of phase just like your home electrical panel, plus a neutral and separate ground conductor. The neutral and ground are bonded in the main electrical panel wherever the hookup originates. You could hook up a 120V 30A camper to a L14-30 hookup... you would have a cable that only connects the neutral, ground, and *one of the two hot feeds*. That would provide 30A 120V service. You could actually make a sub panel that converted one L14-30 receptacles into two L5-30 receptacles and you could run two 120V campers off one hookup. L14-30 just gives you more options.