Tire pressure is not critical on such a light trailer so a little under max is ok, but too hard and the tires will bounce off the road.
here's a method jeep guys use and I do with all my vehicles and trailers. Jeeps are a special case because generally they have big tires which are rated for a much heavier vehicle so setting pressure is non standard.
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You can also “calculate” your tire pressure with the chalk method. This involves coloring a section of your tire with chalk to see how much tread is making contact with the ground. Start by finding a flat road surface. Concrete is actually the best choice, but you can also do this on asphalt. Make a mark with soft chalk that goes all the way across your tread. Then, gradually drive your truck forward about 50 feet and then backwards 50 feet.
Analyze the chalk on the tire. If the chalk is only worn off on the center of the tire, reduce the tire pressure slightly and go through the process again. With the adjustment, you should see the chalk wear off more broadly. Keep making tiny adjustments in the tire pressure until the chalk wears off evenly and all the way across the tread.
You will have to complete this process for each of your four tires. Once you’ve found the right street pressure, add 10% to all four tires. Then, measure the tires and add pressure to balance them. As explained above, you need to measure from the wheel to the ground. Start by balancing the profiles of the front tires with each other. Then, balance the front tires again with the rear tires. Always adjust the tires with the smaller profiles by adding air.
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also, FLA is off topic but still good advice. You don't think about trailer tires because they don't wear much but before you know it they are 10 years old. The sun is the enemy and tire covers will add many years of life . Getting them off the ground sitting over the winter helps too.