Television Mounting

OK, Here's my issue. I have 2018 KZ Sportsmen LE 291RKLE (upgraded tow vehicle since my last post, Thank you). It didn't come with a television however, there is an entertainment area where one is to go. I want to mount the TV in this area due to the fact that the right-sized TV with the "feet" attached will not fit (depth). I've tried 3 different stud finders and unable to locate any studs in the area, which is directly behind the shower. The mount I have comes with 2 1/2" lag bolts to mount it. Absent the location of studs, I will not try to use these for fear that I will go through to the shower. I called the dealer and was told that they believe there is a 3/4" backer behind the TV area for mounting and they are unsure of stud location. I have yet to receive a response to the same inquiry from the manufacturer. Does anyone here have a similar set-up and, if so, what type of mount did you use? The TV is very light and I'm contemplating using 1" large diameter screws with washers to get the job done. I have no intention of transporting with the TV mounted so road conditions shouldn't be an issue. Any thoughts?

Thanks,
Rick