If i am not mistaken many of the liteweight trailers do not use plywood for the floor but rather a sandwich of wood and foam which has been known to create soft spots such as you describe.
Looking for soft spots in rv floor.
Soft spots in their flooring.
Why do campers get soft spots in the floor.
Be especially vigilant around slide outs places where plumbing is above the floor such as in kitchens and bathrooms and all around your freshwater storage tank if it is inside.
In any scenario when it comes to rv flooring you re looking for durability ease of cleaning and lightness of weight all of which laminates offer.
Move around the whole interior of your rv travel trailer testing the floors everywhere for a soft feeling and noting the locations on a roughed out floor plan.
You can sometimes ignore it for a while but it can get downright dangerous.
Many folks who love and preserve an older rv have found a painful reality in their treasure.
A spongy rv floor indicates rot in the subflooring usually the plywood underneath the laminate tile or carpet.
Welcome to the forum willyum.
Usually the problem can be traced back to a water leak that s compromised the integrity of the floor.