We've tent camped 5-6 times a year for nearly 20 years so all our stuff was outside. Cosidering we had a refrigerator 70,000 btu gas cooktop oven, multiple action packers, screen tent, easy up awning, chairs, coolers, booze, etc. you get the idea!
only 1 time were we robbed and that was while we were sleeping our vehicle was broken into and some cheap golf clubs were stolen. This was by a group of teenagers who also stole from some of the other campers in the area.