The vinyl flooring in most travel trailers is not glued to the subfloor, it is free-floating and secured only at the sides and at any penetrations (ducting, islands, etc).
Injecting glue under the floor is not a good idea, there's no guarantee that the glue won't seep upward, into the color layer and stain the vinyl flooring where the glue is injected. Then, even if it doesn't show through, it will secure the flooring in that area. As the RV shifts and twists, the flooring will pull and may rip in the area where you inject the glue. Also, during the winter, while the trailer is in storage, as the temperature drops, the flooring will contract. Any part of the floor that is adhered "could or could not" cause a problem.
In the recent past 3 to 8 years ago, there was significant problems with vinyl flooring cracking from the cold. While that problem "seems to have gone away" there's no guarantee that similar problems won't surface with the flooring type being installed in current trailers.
ANYTHING that you do to change or modify the floor can (and probably will) be used as a reason for the problem. I'd urge you not to start experimenting with the vinyl floor, but let the dealership handle the repair.
Usually, if there's a problem with the flooring, most dealerships have a contract with a flooring specialist in the local area and call on them to repair any splits, cuts, tears or other problems with the flooring. Typically, they are experts and can do the repairs professionally and the first time.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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