It looks like you are close the max loading of the
tires but OK unless there is much more
weight on one side of the trailer than the other. As said in another post!
I'd suggest running the tires at the maximum pressure stamped on the sidewall to reduce sidewall flex. That should help reduce the chance of blowouts. Remember to check pressures when the tires are cold. Even a run of 5kms will warm up the tires and give you a false reading.
I have a 2008 17.5 foot
Bigfoot which has a different axle (4400lbs) and 15" rims. I don't know if you are on 14" or 15" rims. Depending on your tire and rim size you might want to consider going up a level to the next load range tire when it comes time to replace them.