Ron,
I have no clue what the best manufacturer would be, but I've had Interstate Batteries for every automotive and RV application for years and have no complaints. Interstate Batteries has a dealer locator on their website,
www.interstatebatteries.com. I'm not a battery expert but everything I've read indicates that there is no better choice in terms of deep cycle applications than wet cell lead acid, especially for dry camping. I would find it impossible to maintain them properly without an easy way to access the top of the batteries with plenty of clearance (drawer pullout). In my class A, I had 4 x 6V batteries in a large non-pullout compartment with plenty of clearance above...I could almost get my whole body above them...but still they were a backbreaking hassle to pull all the caps and fill all the cells. I love the PC pullout drawer, what a pleasure. I'm plugged into shore power year-round (when not dry camping a few weeks a year), so I pull the caps and check the cells once a month. I don't have to add water every time, but often...more often as the batteries age. I like to have a good look at them anyway, and since I do watch them, I don't get corrosion and keep the terminals sprayed with anti-corrosion spray and wipe them clean every time.
