"coachman05"....I have friends who often bring over new to them RV's that they would like me to go through, fix and spruce up a little.
On the exterior, I get my son-in-law to scrub the roof and then clean and polish the exterior, pretty standard stuff. After that, I start in on the rest of it. I clean the visible part of the frame and repaint with a spray can, making everything black again underneath. On yours, that would include cleaning up the fifth wheel and painting.
If the bumper is painted, it gets a new coat. Clean the rims and put a coating on the tires. If the trailer is really lifted above the tires, I spray the wheel well with spray on rubber coating.
I go around to all the windows, door frames and trim edges and clean off any excess putty that has oozed out. I use a plastic scraper and then follow up with OOPS to clean off the residue. Often you see hoses, tape or electrical wires hanging. I secure those and make sure they're out of the way and hidden.
Do you ever wonder why a new car or motorcycle always shines better when it's new? It's because the areas behind the parts you typically clean and polish are clean and shiny. Once they get some mileage on them, the parts that you can't reach or typically clean get dirty and they no longer reflect back off of the parts in front of them. I try to deep clean and get those parts as clean as possible.
Just go over your fifth wheel inch by inch and fix things that are broken, oozing putty or need painting and repair. The trailer will look great when you're done and people will notice.