The load capacity of the tire changes with inflation pressure. From the manufacturer's web site, here are the capacities of a typical 205-14 trailer tire at various pressures:

25psi-1170lbs
30psi-1300lbs
35psi-1430lbs
40psi-1530lbs
45psi-1640lbs
50psi-1760lbs

A 5psi pressure drop results in a 100lb capacity drop.