I am only going to speak on the refrigerator issue.
In my previous 5th wheel the refrigerator started to lose the ability to cool. I found yellow powder like substance when I looked at the back which indicated a leak.
I ordered just a cooling unit replacement and put it in. The hardest part was getting the old unit off of the refrigerator. This is something that you could do yourself with basic tools and aptitude in a weekend.
I ordered my unit from RV Cooling Warehouse.
RV Cooling WarehouseGood luck and happy camping.
Dave