The Cobalt trailer we built weighed in at about 800lbs completely empty so I'd have to guestimate that it was probably around 1200lbs or so full with the wheels on the front, our gear, tools, cooler, canopy, etc. I really thought it was going to be lighter than that so I was a little surprised to see that number on the scales! We had roughly 10% tongue weight empty but with the wheels on the front I'm sure that percentage was a little higher.
The Goblin had no problem accelerating with it but I also make a pretty decent amount of power, however, it really didn't like the highway speeds. The car is already not so aerodynamic and then we **** near doubled the weight and pulled a wall behind us. I'm sure the shopping cart on the roof was partly to blame too though.
Braking was fine but according to the laws I read you have to have trailer brakes if the trailer weighs more than half the vehicle weight so we were definitely illegal there but the car didn't have any issues stopping. I should probably mention that I have Brembos on all 4 corners so I'm sure that helped a bit. We didn't have any emergency stop situations so I can't say if it would have held traction or not under those conditions.
Steering was never an issue, we didn't had any understeer or trailer sway or anything. The steering did feel a little lighter than normal. It did a fantastic job of holding the car straight while doing burnouts though!