I know several local dealerships in my area that allow customers to take home gear to audition. I don't know if they allow anyone to borrow stuff, but, they certainly allow it for good regular customers. I personally would not ask to do a home audition of delicate gear that is prone to being damaged, like turntables and large speaker systems. I know a dealer who has allowed people to take home phono cartridges to audition, including some crazy expensive cartridges that I am afraid to even touch.
If you are a good customer, dealers will go to quite extreme measures to accommodate requests. I once had an interest in a new linestage. A local dealer carried three lines that I had an interest in, but, he had none of the flagship models of those lines. On a handshake deal, he offered to buy all three flagship models if I promised to buy one of them. I took home the first model he got in, liked it, and purchased it without having him get in the other two.
If you are a good customer, dealers will go to quite extreme measures to accommodate requests. I once had an interest in a new linestage. A local dealer carried three lines that I had an interest in, but, he had none of the flagship models of those lines. On a handshake deal, he offered to buy all three flagship models if I promised to buy one of them. I took home the first model he got in, liked it, and purchased it without having him get in the other two.