I think that it is very odd a huge Earth Roamer is pulling a "Light Weight" trailer. That trailer is designed to be pulled by smaller cars and SUVs, or even a large Adventure Motorcycle.
BTW, those are Motorcycle wheels and tires. While they would work fine, I have owned many motorcycles and you will not get more than about 8K miles out of those tires, 5-7K is more likely, they are for Adventure bikes that are 4-600lbs. You would be very limited on that trailer due to the max load of those tires.