Wow, I hope weatherproofing isn't a concern. The utility boxes I've seen at campgrounds have a cover over them. The outlets in those boxes are really not meant to be exposed to the weather and neither should the RV connector. Correct me if I'm wrong.
2015 Greyhawk 29MV
Honda CRV toad with Blue Ox baseplate
Ready Brute Elite towbar with braking system
TST 507 Flowthru TPMS