Maxxis are not made in China and seem to doing well according to what I've read in this forum.
According to Voltage, each axle is rated at 7,040 pounds and the tires are rated at 3520 (totaling 7040 per axle). The 3 axles and 6 tires give a total weight hauling capability of 21,120 pounds, which is 2,120 pounds over the 19,000 GVWR of the trailer and this doesn't count what's on the hitch. One might go so far as to say that airing up the tires to the 80 pounds max load rating listed on the sidewall is most likely over filling the tires, which also may cause a failure since the tires don't need to carry 21,120 pounds.
If the trailer has a pin weight of, say, 3500 pounds then the tires only need to hold up 15,500 or 2583 pounds per tire, which, again, does not need 80 pounds of air.
So it seems to me that Voltage has over built the trailer for hauling the given weight and that is commendable.