YMMV, but... if you, as me, use your rig for working, this is, besides the joy that means being able to make music with it, the answer -at least in my case- is NOT BY ANY MEANS, NO. The long and sad story of bad things that have happened to equipment borrowed from my hands and the work and pain it took to put those into shape again are a constant reminder of that I-must-not-let-anyone-but-highly-trusted-and-proven-professional-friends fumble with my toys. The sad part, it is not about being selfish or generous, but about how careless some people are, and the little-to-none warranties there are for my equipment to be back home safe and sound (specially sound).
There are backline rental companies out there. If there are so many bands going to play, and not a single one has/is able/willing to put their own amps in there, they can pass the hat and rent some amp, IMHO. It has happened to me before, and is a way to make it work with little damage to everyone.