Normally it will depend on the power and weight of the towing vehicle. Without trailer brakes usually one doesn't want to exceed the weight of the towing vehicle..which in this case also includes the operator. It must also include the weight of the trailer itself so...how much does that 6x10 weigh? As for power...well..I guess if you start burning-up belts or has a problem moving or going up hills even in low range.. one could say it's overloaded a bit. Load on the engine also has to include the load on the tow vehicle which includes the operator, any gear and the weight on the toque. The difference between 800 and 1000 pounds is minimal and won't make much difference especially if the travel-zone is level. Be mindful of the toque weight as these are having issues with bending hitch and sometimes frame parts. Good luck. On a side note I've seen people pull insane things and get away with it. Safety first though.