You have a single axle trailer with a GVWR of 2995 lbs, thats pretty high. I would suggest that you get it weighed but you can get a pretty good idea by just weighing the tongue with a bathroom scale. With the trailer empty, put a jackstand on the scale and record the weight. Then put the tongue of the trailer on the jackstand and record that weight. Subtract the weight of the jackstand and you have the tongue weight. The tongue weight should be about 10% of the total weight of the trailer.
If your trailer weighs 1500 lbs, then the tongue should weigh about 150 lbs. BTW, this is not universally true, tilt trailers and ATV trailers do not always follow this and can be way off in one direction or the other.
When you load the trailer, you need the tongue to have about 10% of the total weight of the loaded trailer, in your case about 300 lbs. This 300 lbs goes into the GVWR or the truck, so that and your 200 lbs leaves about 800 lbs for pavers in the bed of the truck. Put those as far forward as possible for stability.
If you have less than 10% of the total weight on the tongue, the trailer will be hard to tow as it will want to whip back and forth. This is especially true with a single axle trailer, they are the hardest to tow.
Be sure all your tires are inflated properly before you start this trip. Check the sidewalls of the trailer tires for the max load and at what pressure for this max load. A 3000 lb trailer, minus 300 lbs carried by the tongue will need to be at least 1350 lbs. If they are any less than this, reduce your load correspondingly. If the tires are over 10 years old, you may need to just replace them.