j-d,
Are you sure that's a "true" deep cycle RV battery in your photo above?
I rotated and blowed up the image ... and I see the word "Cranking" ... which is probably part of the spec phrase "Cranking Amps".
True deep cycle batteries may not list cranking amps ... and if they do, what's the purpose of even mentioning this performance criteria for use in deep-cycle-only applications?
Here's a partial side shot of the battery in your photo above ... note that the phrase "Marine/Deep Cycle RV" is printed on the side of the battery down near the bottom ... which means that the battery is not a true deep cycle battery manufactured solely for optimum deep-cycle-only type service: