The poor design and placement of these connections was a frequent complaint here for a while but seems to have faded away.
If I were now looking at trailers, this would be one of the first things I would check and if I found these under the frame, I would keep walking as it is an obvious choice to keep putting out a bad product!
If I understand the situation correctly, Winnebago bought a smaller company and doesn't really try to correct many of the things that comany was doing wrong! Just scarf up any profits and forget the reputation.
If you are the current owner of a trailer with connections like shown in the picture, you seem have few choices. Correct it now, wait until it fails or sell!
This is not one that is going to get better if it is left in the way it was built! There is simply no way we can expect hot battery connections that are placed outside and in the spray from the road to not become a problem and when they are placed less than a half inch from the frame used as ground, it is going to fail!
If you are not interested in a lifetime of fighting nature, I suggest fixing this sooner rather than later!
At one point, I would have been inclined to say it was becasue Winnebago bought an inferior company and needed time to correct the defects.
But after years, that can no longer be a good excuse! The new generation of management at Winnebago should be ashamed!