You will need to contact JAYCO using your VIN number and they should send you some BUILD PDF files to show where the studs are located. JAYCO has sent me such drawings in the past upon receipt of the request to my email address.
Most of the trailers have the wall marked with a label showing it has a backboard installed inside the thin wall to support the HDTV mounts... My trailer had one such label in the main room and also in the bed room wall.
You can usually find the small studs by thumping on the trailer thin walls. Some studs may be wood but I think most of them are using small light aluminum extrusions now...
Otherwise it would be wise to just mount an one-inch thick backboard first using what is called MOLLY BOLTs across the wall to screw your HDTV mounts into using regular wood screws.
Would look something like these google image photos...
The backboard spreads out all of the weight involved so you won't have the screws being pulled out of the thin walls...
Roy Ken