I've had T.M. suspenders on my T.M. harness for 5 years, mainly to keep it in place when I hang a chainsaw on my harness, no problems or complaints, I guess it's personal preference and what makes you comfortable .
Both...I grew accustomed to the SRT attachment on my Sequoia and miss it on the TM. Also, carrying a big saw tends to pull the harness down a bit, too.
I'm hoping some of the other suspenders on the market might be compatible and comfortable.
Iv got a setup on my tm because i also missed my sequia setup, i just use two short eye to eyes on each red ring by your hips, they both connect to a oval karabener and then i connect that to a petzel secure. Works great to fairlead your systems or just to hold your harness in place