Advice on a place to camp near Mt. Rainier and Mt St Helens

For Mt Raineer, Alder Lake looks good. Nice park, I have stayed there.

We are thinking of doing Mt St Helens and are looking at Seaquest state park or probably the KOA in Longview. We haven't stayed at either of these yet.

We are also considering staying at Taidnapam and trying to do both from there.

I'd like to hear what people think about where to stay as well.