Solar setup question

I have decided that I am going to purchase a suitcase solar panel instead of a rooftop mounted one.  My 2020 R-pod has the pre-wired solar connection on the roof.  I only want to use the suitcase to occasionally charge my battery when I do not have shore power.  I am wondering what will be the easiest way to connect the solar suitcase when in use.  I do not want to get up on the roof every time I am setting it up.  I have my batteries boxes locked via cable locks, and I would rather not have to open them up every time I hook it up (but I could if this is the best way).  Do they make switches that you can wire to the battery and install on the outside of the battery box?  Any advice would help.

I have used a GoPower 80W suitcase for a couple of years and find it very efficient for charging our battery.  It comes with a Zamp connector, alligator clips for the battery terminal and an Anderson connector that you can place on the post with the other wires and then hang the connector out of the battery box so you con't have to open it every time.  They all come with covers so weather's not an issue.

Thanks for all of the advice.  As far as attaching the solar directly to the battery, what is the best way to do this with two 12-volt batteries in parallel.  I assume you attach them to the the opposite terminals (negative on one battery and positive on the other) that are not attached to the leads that go to the pod?