Finding Studs Behind Exterior Aluminum Siding

The framing in this trailer is wood constructions with aluminum siding. I tried the infrared temperature gun suggestion thinking there might be temperature variation between stud and insulation between studs. If there was it was not enough for me to have confidence on stud location. Tried the knock test. We will be going camping in a week maybe I will be able to see with the dew method...

I was thinking of using the smallest drill bit possible and find the stud on the inside and drill all the way through to the outside.