I would definitely avoid dropping the whole belly cover on my Kodiak Cub 21 ft trailer. It requires removing and replacing hundreds of self drilling and tapping screws into the steel frame. If yours has not been removed previously then you may have to pull nails out of the frame to start with and drill and tap all new holes.
I had a tiny leak. I drilled a 1/4 inch hole in the cover and let the water out. The leak stopped soon after. Definitely the easiest.
On the other hand, if you are willing to make it a big project, drop the whole cover. Dutchmen runs wires and pipes helter-skelter through the under belly. Tie them in bundles and protect them from sharp edges for longer service life.
Insulate the hot water pipes for more hot water at taps. I also insulated and sealed holes and cracks to protect the pipes from freezing.