'93 tracker 1.6 8V 5 speed here
I have a homemade tilting flatbed trailer that I pull w/my tracker it weighs about 300lbs empty.  I have put 2 sport quads on it before at around 400lbs a piece so total loaded weight is probably about 1000.
Like everyone else said it pulls fine just need to downshift a bit but allow a lot more room to stop.  It got away from me once on a steeper hill in central PA.  I could maintain speed but not get it stopped until the bottom of the hill.  My engine has 255k+ on it so there's not much compression left to help 

 and the brakes were not enough.
I would say anything over 1000lbs should have trailer brakes to be safe IMO.