What is Reddit's opinion of Camco Heavy-Duty Electrical Dogbone Adapter, 50 Amp Male to 30 Amp Female, 18 Inches (55175) , Black?

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Sorry, I kept squirreling trying to write a response.

There are many numerous adapters for 50A (four prong) to 30A (three prong) adapters for campers. I have the one below, even though my camper is only 30A as this will allow me to use a 50A socket if I move the camper to a site that only offers 50A service. The rule of thumb is it's better to have it and not need it than to need it and not have it when it comes to power adapters. Generally speaking, in my toolbox for the camper, I have two adapters. One of the below (30A to 50A), and the other is a 30A to 15A. The 30 to 15 adapter will allow me to power up the camper, but I can't use any high load devices like the air conditioner or microwave because I'm constrained to 15A of the feeding circuit. Just because it "fits" doesn't mean I can use it all willy nilly, anyone with a camper can explain why using the microwave and the air conditioner at the same time is a bad idea.

https://www.amazon.com/Camco-55175-PowerGrip-Dogbone-Electrical/dp/B000BUTDCA

This is one such adapter and the way it works is that it connects neutral to neutral and ground to ground, and only one of the hots on the 4 prong makes it to the 30A connector. This is considered "safe" because it transports the neutral and the ground to the RV as expected by the RV's electronics. If a fault happens in the camper (e.g. hot shorts to chassis(ground), or hot shorts to neutral), your 30A feed breaker in the camper would pop first.

I could yammer on and on and bore everyone about differences between 30A and 50A service with respect to campers and camper power systems in general but I won't unless asked simply to save everyone from my droning on.

I know Amazon has them (50 to 30 and 30 to 50), but you've GOT to make certain you get the right one. If I remember correctly, they're about $30.

Edit: Here it is

This is a 30 to 50 adapter (assuming that's what you need). It's $18 - even cheaper than I thought. If you need it fast, maybe look for a local Walmart or hardware store.