Subject: Re: RMD's at Vanguard
"So now with the RMD out of the way, I will do a big Roth conversion which will almost drain the TIRA. Then in 2025, I will make second and final RMD and convert what's left to Roth. After that, no more TIRA, no more RMD's."

I'm not sure why you want to eliminate RMDs. By taking a big Roth conversion, you will pay taxes at a higher rate than you would pay by spreading the distribution out over multiple years (assuming 'big' means bracket moving size).

Keep them to a manageable size - yes. Pay more taxes than required - no.

Just my philosophy. I just convert enough to stay within my bracket.