Very nice modification to that area. I am thinking of using the 'V' area between wheel humps for canned goods storage. Using plexiglass strips and writing the can contents on the lids so it can be read easily. They couldn't roll around!!
RV Fridge Fan | Cooling Unit Fan | 12V RV Fridge Fan | RV Fridge Defrost
Check out this frig fan controller and temp monitor. 'Paul' the owner has it figured out. He recommends a fan for sale on his site and it works sweet. Send an email to him and he'll call you back.
I installed the set on ours but haven't tested it in hot weather yet. I did make a heat chamber to try and cook the boiler ... His unit protected it as advertised. Being able to monitor the temps etc. helps you optimize and troublshoot the cooling unit.
Full disclosure ... My cooling unit has been rebuilt too but I am awaiting a part to finish testing.