Hi Argosy2, Welcome!
I started at the top and worked down. I'm still working. I replaced the air conditioner, power vents, resealed the sewer vents, installed new gaskets on the windows and door, sealed seams, and fixed leaks. I replaced the running and clearance lights, rewired the 7-way system, and installed a new breakaway switch. Then I fixed the frame and installed new wood floor where needed.
I removed and replaced the original copper gas lines and replaced the gas shut offs. As a part of my early work I repacked the wheel bearings, installed new grease seals, checked and set up the brakes, and installed new tires.
Now I'm working on the bathroom and kitchen areas with a new water heater, new furnace, new sink, new gas range, new plumbing, new cabinets, and new countertops. I haven't pulled the refrigerator yet but that's in my plan. The refrigerator either works like new or it gets replaced.
My final phase will be to install new laminate flooring, new blinds and drapes, a new sofa, and a new pedestal bed.
I expect to finish this trailer and go broke on the same day.