I've used dogbones from 50 to 30 and even to 20/15 in all kinds of weather without any problem for over thirty years. Obviously you shouldn't leave any unsealed connection laying where water could puddle and short it out, BUT all you've got to do is elevate it (a short piece of 2x4?) a bit and it will be fine. I try to run my cords and connections underneath slideouts or whatever as well.
__________________
|