It is a three stage process to properly torque the lug nuts.
Wheel Size Stage 1 Stage 2 Stage 3
12-13" 20-25 35-40 50-75
14,15&16" 20-25 50-60 90-120
remember the sequence is also important.
If you need more info, check the Dexter site, there is a complete table of the torques and sequence for tightening all the various sizes of wheels, etc.