If the trailer had brakes, your 4Runner will do great towing 3300 lbs. You're setup well for that. I've only towed trailers that had brakes. I don't think it would be good with that much weight to not have trailer brakes, but I don't know.

Hey, I just ran across a cool webpage that lists all states laws about trailer brakes:
http://www.rvsafety.com/StateBrakeLaw.htm
Looks like you'll have a problem since CA requires trailer brakes for trailer weights over 1500 lbs (according to that site).

Jeff
2000 4Runner SR5, supercharger, rear e-locker, ARB front locker, 285/75R16 MT/R's, custom bumpers & skids
2007 Tacoma double cab 4x4 - stock