I agree but with my van the cable would get in the way.. And this way couldn’t overcharge at all. I have this setup on my bike in the garage and keeps The battery in top condition.If you can set up a hook up at home and leave on hook up permanently when not in use, unless using very regularly. This way the battery is always fully charged. A friend does this with his narrow boat with 4 X 120Ah leisure batteries and after 10 years are still in excellent condition. I leave my van on permanent hook up at home when not in use.