I've seen a number of posts in RV forums that Charles Schwab can be "problematical" for full timers.
I did a search on Charles Schwab here and nothing came up, but over on the Escapees forum, the same search turns up reports that Charles Schwab closed an EXISTING IRA that someone had had with them for 14 years because they now had only a mail service for an address. Do the search yourself.
Go ahead and try Charles Schwab if you really want to do business with them, but have a Plan B in mind if it goes south. And do let us know what happens.