The problem is, it's like locking a tent. Make the zipper fool proof, they'll just cut the fabric. No matter what the lock, a crow bar will easily break a RV door open. Maybe get a better lock, but always close all blinds so prying eyes can't easily see your equipment inside, and always take the laptop with you. I would think an alarm system might have better results. On that sensed someone walking around, slight warning, someone gets in, loud warning.