I've done loads of gigs on this type of circuit - 3 or 4 bands, the headliner provides the bass amp. I've never had a problem, but my pedal board's so huge, I always had to drive to gigs anyway, so i'd always take my full rig. I've never had a soundguy get annoyed with my using my own rig, even when there's a shared rig set up for the other bands. The only time someone told me I couldn't use my own rig was in a battle of the bands, where apparently being able to hear myself would have been an unfair advantage.