I tinted all windows in our old Fifth Wheel... We didn't have dual pane windows so the tint material helped when I was running the A/C... it seemed to cut down on the sun radiant heat.
Bought the Window Tint at Home Depot... and took time rough cutting the material before I applied it to the windows. Started by cleaning the windows.... checking for streaks and lint before I applied the film/tint.
Tools needed was a Spray bottle of water, plastic squeegee, scissors and a razor knife and a straight edge. I used a sheet of plywood for a cutting surface so I wouldn't mar the counter tops and table top.
Once each was cut to just over size of the window... Following the directions... I sprayed the window with the water bottle.... applied the Film/tint and used the squeegee to work the bubbles of air from under the film/tint. Once it was free of all air bubbles I would cut the edges to the shape of the window.
The results were good.... not a one ever pealed. Nice advantage too was it made it difficult to look into the RV during the daylight hours. The reflective surface made the windows look like a mirror.