GAWR and GVWR are located on the sticker usually on the driver's door. take weight of trailer + weight of your explorer and all the stuff, and that should not exceed the GVWR. Make sure that the tongue weight of the trailer is correct too, if the weight on the rear axle exceeds GAWR you risk damaging your rear axle, suspension, and tires.
If I recall correctly, most explorers can pull 3500 pounds okay, but only on moderately flat land. I don't know anything about the older ones though. You really want to consult your owner's manual and weight rating plate for this info.
If possible post which engine and transmission you have.
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