By your ratings, you presumably have a 1 ton srw truck. And said truck will have between 3000-3500lbs on the rear axle with fuel, some passengers, etc, but otherwise basically empty truck. Your "rated" rear axle capacity is probably 7000lbs givertake, which is based on the weakest links being the ratings of the OE tires and rims. Leaving 3500-4000lbs for remaining payload. (May require or desire a little suspension help)
If you're asking the question, err on the side of caution a little, both due to your inexperience towing/handling this size/weight of trailer and also to account for other "stuff" that may be detract from remaining payload.
Splitting hairs between the sticker "ratings" is a futile exercise and really just a good ballpark for a "safe" capacity.