Re: robalo weight
It's not the towing that's the issue. It's the "stopping"!
My Saab 9-5 4 cyl is rated for 3500 lbs (right from my manual) if I was towing a boat and the trailer had it's own brakes. My book says only rated for 1000 lbs, if no brakes.
I wish I had brakes on my trailer (even though I'm only at 1000 lbs) because when in a sudden stop situation, I have to stand on that pedal
So if your trailer does not have it's own brakes make sure you keep big distances for other cars.