Generally there is no real need to use triangulation to locate a rogue radio on a trunked radio system. If it's truly a rogue radio, especially if it's causing serious issues, they would simply use their system console to send out a "kill" command to the radio in question. This would "brick" the radio, putting it in a state where it won't transmit, won't receive (normally at least), and this state can't be reversed by simply reprogramming it. The radio can be revived in only two ways (perhaps a third if the user has the right blend of software, hardware, and saved pretty much everything from the radio prior to the kill), sending it to Motorola for revival (and they'll ask many pointed questions on how and why it was killed in the first place), or by sending an "unkill" command from the exact same system console that sent the original "kill" command.
There are ways to triangulate on the radio if it is a problem, but not a big enough one for them to simply kill it. Basically where it's more important to catch the person and recover the radio than simply remove the problem. They can send various commands to the radio so it sends signals that they can trace without disturbing the general radio traffic that much. Think things like an I-Call (call to an individual radio, not over a talkgroup), and the like.