Water "Proofing" 30 amp Connections

Here in Ontario runs to the campsite power post can be quite long, 100' or more not being unusual at all, so using extension cables are a way of life ... to solve this I long ago built a set of custom 10 gauge extension cables terminated with Leviton WetGuard connectors which in years of use have proven to live up to their name when used in really wet conditions. That said, I still have a couple of 25' cables with the standard 30 amp RV connectors which don't offer any particular protection from heavy rain or pooling water. I've never been comfortable just leaving these connections lying on the ground so like most I will at least try to protect them in some way, using an inverted bucket, stool, piece of wood, campsite picnic table, etc, to elevate the connectors off the ground. I'd prefer using some sort of water resistant enclosure designed specifically for the purpose but have never have come across anything suitable, even plastic tool boxes have always been too big. Recently though I discovered an inexpensive plastic shot shell box manufactured by Plano Molding that is readily available just about anywhere, is just the right size, and which has a hinged lid with a rubber O-ring that is secured tightly with a brass bail latch. Modification involved only cutting in the required cable entry & exit holes with a sharp knife and adding a couple of rubber grommets for a tight seal ... pics are below for anyone that may be interested.

30 amp Connection Protection - 2 pics