Twenty odd years back the good Colorado Springs and Denver audio retailers would let you do weekend demos, if you were known and or used CC as security. I listened to a lot of preamps and power amps over the years.
I never did ask to take home speakers. Floorstanders would be a chore but I'd have done it. Fortunately the ones I chose did work fine in my home (and lasted 16 years...).
I would think in the changing times that borrowing equipment is more rare now than before, but the best high end dealers probably should get it. I'm curious to hear the recent experiences of others. thx.