Walmart will have what you need on shelf. 29DC ($99.97), 27DC ($81.67) DC = deep cycle. Best part is if they go bad under warranty, there is always a Walmart near by.
I use these in my 5er and my utility trailer. The 2 current ones are going on 6 years old.
But the pickup camper got AGM's made by Universal Battery. I had cabela bucks available so I spent it on two 27 series 95ah AGM's.
from internet:
Everstart branded batteries sold at Wal-Mart are manufactured by Johnson controls, This is the same company who manufactures batteries for just about all of the "big box" stores as well as most of the discount auto parts stores. Johnson Controls also makes batteries for Interstate battery company, Ford, GM & Chrysler.