Hi Kevin
I'm glad that I did replace it but what a can of worms to open. It was my first time at the subfloor. i'm a fairly handy guy but one may say I'm not precise so it took me longer cause I went slow.
If you can only do the one section, I would just do it if you know your floor is in good shape. As I took mine a part I found more and more cracks in the
fiberglass floor which rotted the whole floor and most of the cabinets. Another spot to check is behind the
fridge. The upper
fridge vent is very poorly designed and allows waters to run down the inside wall and rot the floor (at least in my trailer it did)
What I did was take a circular saw and cut the flooring 2-4" from the edge of the trailer, setting the blade just high enough that it didn't cut the
fiberglass under neath. In some of the corners I had to use a Jigsaw but I would probably go out and multi tool saw that you can cut the corners where the saw could reach.
I also cut 12-18" squares in the plywood sub floor so it was easier to pry up.
It was a lot easier and cleaner to fix the
fiberglass from the inside instead from the bottom of the trailer
A tip I could give you is when you do the floor cut back the sub floor so the joint is over where the frame is for more support. when I did the whole floor it didn't always line up with the frame, so I did a lap joint