One caution about running a dedicated extension cord back to the park outlet.
The park where I'm at has great power near as I can tell.. Some others disagree with me but one of the things that makes it good is this.
Mist parks you have something like this;
Box w/200 amp breaker-------Site box----Site box---_Site box----Site box
We have
Box with 50 amp breaker-----Site box
l. . . . 40 amp breaker-----site box
2 - 2 - .50 amp breaker----- site box
24 sites
Each site has it's very own breaker in the master panel
Now all sites here are 50 amp so it's all I can eat but .......
IF you were on a 30 amp sites (Actually 2 sites are less,, They are tent sites) you will trip the park's "Master" breaker instead of the one you can reset. If you come to a park like this.
Of course parks wired properly (like this one) kind of rare.