The box you linked is the correct receptacle for a 30 amp 120 AC Volt RV plug.
As a recommendation, look for that style receptacle with a 30 amp circuit breaker in the box with it. This allows the power to be shut off from the receptacle "before" you plug or unplug. Coming from an industrial background, we are taught on higher current plugs & outlets to kill the power before plugging in and unplugging for safety. Many campgrounds have these breakers next to the RV outlet and I always power off before plugging and unplugging. On a normal 15/20 amp outlet, the risk is lower as the plug does not fit as hard in and out of the outlet. On a 30 amp plug, they need to be very tight and the plugs often do not have a hand grip on them. Your fingers can get real close to the blades trying to get out a stuck in 30 amp RV plug. Shutting down the power eliminates any shock hazard. Here is one of them.
https://www.amazon.com/Power-Outlet-...4&s=hi&sr=1-11
Do not know if you need it or not, but will mention it. By your note and setting for your camper, it can be handy to also have an extra 20 amp 120 volt receptacle to run other items in addition to the camper. This type of box does the 30 and a 20 amp.
https://www.amazon.com/Connecticut-E...8&s=hi&sr=1-69
Hope this helps
John
PS. Make sure if you have someone wire up that 30 amp receptacle, that is "NOT' a older 220 volt dryer looking receptacle setup. It has to be 120 VAC. This is a common mistake even by some electricians that have never seen a RV receptacle before.
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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