Answer If it is spelled with two r's, as in 'perrito' it means little dog. perito (spelled with one 'r') is a word in Spanish that means 'expert'. Go Log In Sign Up
Trimmer studs, along with other supportive members like king studs, distribute the weight of the structure above the opening around the opening, ensuring that it dissipates evenly through the floor. This reduces the strain on the wall created by the opening.
The other consideration is the blow out resistance that the full length trimmer supplies. The full king does a crackerjack job of holding everything from collapsing. The trimmer, if full length adds additional support. I've had many plans call for the doubling of the king stud, with a single trimmer to beef up the post strength. I did one for Pulte once that required SEVEN kings and two trimmers.