When I had my first 2 pushing up the vinyl floor, I didn't know what they were either. I brought the RV to my dealer to have them check out the problem. When the job was done and I picked up the RV the dealer said that th e problem was the floor hold down screws twisting and pushing up the vinyl. They said they took care of the screws and I was all set.
I went on another trip and 2 more screws were pushing up. So I went under the RV to find what these were anchored to. I found they were screwed into box steel tubing. Using my inspection camera I found that the previous screws that the dealer "took care of" had been removed and the hole filled with putty. I called the dealer and the service manager said that removal was the factory fix for this problem. I asked him how many could be removed before the house fell off the chassis and he laughed and hung up. As I posted, I have repaired 8 of these including the 2 that were removed ( that would be the subject for another post). So far after putting on another 10,000 miles no more have come loose. However I keep a close watch and fingers crossed. I never returned to my dealer for work, i just do it myself, so I guess he, the dealer, accomplished his mission.