I have heard of situation were a (smallish) band will come to tour the UK from, say, America. They may bring a support band with them.
Then they don't bring hardly any gear with them and just engage a UK band a to support the tour (or maybe different band per gig) and gear share the drums and backline off the support band.
Of course the UK band are right at the bottom of the bill, short set before most of the punters are there.
I'd might be OK with it if the US band was someone I was a fan of. Otherwise may not be so keen.