2007TBSS- See if this (sure to be long-winded!) reply covers some of your Qs.
Go with Meguiar's instead of Pinnacle. I don't have anything against the latter, but I think the Meguiar's is the way to go.
No way you'd consider spending a bit more and getting a Griot's 6" RO (I'd still use smaller pads on it) or even a Flex 3401? That TBSS of yours will be a job even with a really potent polisher.
If you get that kit, I'd want some pads in-between the orange cutting pad and the finishing pads. Mabye the LC Tangerine HydroTechs, which, IME, work well on GM clear with M205.
The issue with using yellow pads is that they can instill micromarring, which can then be a paint to polish out. I'd much rather do a little extra work with orange pads myself. I *have not* used yellow cutting pads via PC/etc. for ages even though I have 'em on hand; it's simply not a great way to do it IMO.
The M205 will leave a pretty good finish. Probably good enough. Only nutty people like me would even think to question how it finishes out on GM clear. Yeah, I sometimes think my Yukon coulda used one more final burnishing, but PLEASE don't worry about stuff like that.
Note IME the ZAIO (which I do like) didn't do any extra burnishing when I used it after the M205 :nixweiss So don't expect it to do that for you, but again, eh, just quit thinking about that
Zero evidence of micromarring from the M205 on my Yukon.
ZAIO needs to be worked kinda like a polish so it's abrasives break down. Work it until it's almost dried out then let it haze over the rest of the way before you buff it off.
The oils from M205 can give a pseudo-hologram effect in the sun so be sure to inspect for that and take care of it (if it happens) before you apply the Zaino/LSP.
You might want to consider how you'll clean off the oils from M205, especially if you're using Zaino. I didn't find ZAIO as good for that as I'd expected; some clears seem "sticky" in that they retain the oils and my Yukon was *REALLY* like that. IPA works pretty OK but TOL's PrepWash (link to TOL:
Top of the Line Auto Detailing Supplies ) works better for me and it's cheap.
Try to keep this whole thing as simple as possible, greater likelihood that all will go well. That "cleaning off the M205 oils" thing can be a bit of a complication, and one that you don't always hear mentioned, but IMO it's better to think about *that* than about a lot of extra polishing/LSP/etc. steps.