Review on ⚡ IZTOSS NEMA 14-50R Receptacle: Weatherproof Outdoor Power Outlet for RV, Motorhome, Electric Car, Tesla, Generator, Welder & More by Matt Kim

If you are looking for a way to plug a 30Amp RV into an outlet then this is the solution for you. Excellent durable construction. The device leaves plenty of room for the cord so you can close the weather cover while it's plugged in. Knockout holes allow connection to an outlet. This should do the work for you. Hobby crafters note that you will need a "knockout tool" as this block is strong and a hammer and screwdriver will not pry it open. The plug connects easily and the plug looks high quality.