Have you tried looking those rental up on craigslist.com as well? There are few well known real estate companies in San Francisco that specialize in rentals or property management. Some of the rental agents represent the landlords only, while others work with the tenants and find them properties.
I am not a leasing agent, but I can point you to few companies if interested.
Using trulia for rentals seems to be a nightmare for everyone. We get bombarded with contacts for rental requests when we don't deal with them and renters don't get responses. I would use another service
Most Realtors don't deal with rentals. I would contact someone that specializes in rentals. You can hire someone and typically the Landlord pays their fee for finding a qualified tenant.
Check into property management companies in your local area. Good luck.