they are not checking for the actual weight of your rig...they are going by the GVWR of your rig....and if its a tripp axle. either bumper pull (> 10,000 lbs) or 5ver (>15,000 lbs)...you will need a non commerical class A license to tow those rigs
they actually look at the GVWR on the nose of the rig
and what one CHP pulls people over for...the other will not...its all choice by them