I started using the Pro flow about 10 years ago and love it. Easy to install your self and will help you make the batteries last. After 10 Years and 3 different RV's I had to buy a new set in October for our new Newmar. I picked it up on Amazon and installed on 8 batteries in about 30 mins.
2020 Newmar Baystar 3414
2021 Chevy Trailblazer