Waterproof IP68 is costly, in the main we go water resistance, which could be simply a plastic box over the plug and socket, done that to charge car when one extension lead not long enough, was only connected overnight, plug and socket on a brick, so surface water could not reach it, and the back of house should not have any visitors, although I do know a parcel was once left at back of house, but no real reason why anyone should visit rear of house without invitation.
Front of house a little different, postman, milkman, carol singers, trick or treat, all likely to visit front of house, so any electrical leads need to be where kids messing around are unlikely to come to harm.
If I needed to charge the car battery on the road, then even more care required, and if to be left connected for an extended time also more care required, I look at the power outlet found on a typical caravan site as being the minimum required when the general public including children can access the plugs, sockets, and connecting cables, using a pair of these
to join cables without some further protection like being kept off the ground, and covered from direct rain, is not really good enough, but one of these
in the side of the caravan so feed cable not on the floor, and RCD protected, then no real problem.
wrong time of year for that.
