The side panels are double walled I recently removed the dinette and installed a desk in my 2019 3791. For those that do not have the outside entertainment there is a 2 plug recepticlel with no access inside the table support wall box. That is were it is plugged into. When I removed the table and installed the desk I also installed a wine cooler and plugged the wine cooler into that same outlet. I cut a hole in the front that I can cover with an access plate for future access.
So that would be my approach to cut an hole and install a access plate so you always have easy access in the future. Those electrical towers have a large backing plate and nut (like a faucet) so you also need good hand access to tighten that as well and it is not uncommon for those to loosen over time requiring re-tightening.
here is an access hole I cut in the side as you can see it is double walled
for those interested here is the desk I installed in that area. I also cut access hole in the front