Simple thing to do to improve access, drill two holes larger than finger size to make getting the plywood up easier.
From there, we went a step further. The rearmost dinette seat has a safe bolted down under it where I stash anything. I also made the exterior panel held on by velcro so I can remove it and access the safe. Above the wheel well there I placed my automatic transfer switch, especially since that is where shore power comes in from.
You can see the ATS and some of what we did in this video: