Okay, here's your mulling over.
Klingklang's offensive prowess is terrible with its limited movepool and awful main STAB. It doesn't provide anything interesting to a Trick Room team other than being a Steel-type Trick Room user, and its 90 base Speed is a bit much for Trick Room. It doesn't provide anything neat like, say... a unique offensive type or decent power or coverage or recovery or anything of the sort. All it provides is its Steel typing, which barely qualifies as useful.
The long and short of it is that Steel typing does not justify making an entire Trick Room set (and analysis for that matter) when it lacks every single other notable advantage of a Trick Room setup Pokemon, like extreme defenses (Dusknoir), offense and coverage (Slowbro/Slowking), or recovery (again, Slowbro/Slowking as well as some other mons). Klingklang doesn't bring anything special to the table, and with such a niche playstyle, it takes a lot to actually qualify for a Trick Room set.