Mine (14 ft. Starcraft) cleaned up really well. The interior was better, came with the middle bench and ply between that and the front. The wood was structurally ok so I let it soak up all the clear ordinary wood deck treatment it wanted which was a lot every spring for a few years. That was maybe 15 years ago, still good. Interior paint was still reasonably good. Transom wood should be replaced one of these years.
Decided to go cheap on the exterior too, figuring I could redo a few years later. Sanded as necessary to get all the loose paint off and feather the edges of what was left. I used Naval Jelly for an etch and wiped with lacquer thinner and primed with Krylon. There happened to be a sale on semi-flat Krylon in a standard color I liked so I used that. A standard color so I could always do touch-ups.
Won't win any prizes but has looked respectable for roughly 15 years. Paint has chalked up and needs to be redone, but the paint isn't lifting so it's an easy project. What makes a big difference is that I panted the numbers on in neat block letters (the state requires block). Really looks better than the usual stick-ons.
Again, the project was to go cheap and look good, not super good.
Where I did go wrong was in painting the trailer. I used a better epoxy for that and something didn't go quite right. Stood up poorly to rocks on gravel roads. But then the factory paint didn't do so well either or I wouldn't have bothered. LED lights of course, lights routinely get dunked here.
It's been fun adding gadgets, like permanent lighting, bilge pump, baitwell etc. Much more and it might not float.