I'm very open to others using my gear for shows. I was apprehensive at first, but other members of my band and I have had to borrow others equipment and it's really a huge help to have someone willing to let you borrow gear. Overall it's so much better to make friends and be helpful to the other bands you play with. If you go to shows distrusting and avoiding the other bands you're making things harder for yourself. My guitar I'm more wary of lending, but I play in a alternative/rock band with mostly other punk bands and such, so luckily for me most people would rather not have to use a baritone 7 string, so that's pretty safe. My amp and cab I always lend out. If someone forgot something it's a lifesaver, and for a lot of basement shows I just backline it and let everyone use it. Most bands in the scene I play in just use a clean amp with a pedal board, and my Mesa has a fantastic clean channel and not having to load in an entire band through a crowded basement makes shows run so much smoother. I just stay nearby to make sure everything runs smoothly.