My $0.02:
I am not a lawyer, BATFE agent, or anything else besides a guy who buys, sells, and uses guns frequently. I am also new to suppressors, and can only go off of what I know from research.
The trust from SS is convenient, but is just another generic trust. You can get one for free from multiple sources, including a post stickied in the AZ HTF. I used Quicken Willmaker 2007 for my suppressor, because it's the same I used for my SBRs. If it were me, I'd save the money and go this route. Also, it's just a trust, there's nothing actually called a gun trust. Only people buying NFA stuff call these gun trusts, as they are really just trusts.
You can travel with your suppressor anywhere they are lawful (i.e.: you can't take it to Cali just because). No paperwork necessary to take across state lines / fly with it, besides your tax stamp (copy). Others will say bring a copy of your trust too, to show you are a trustee and lawfully allowed to have it.
CCW doesn't help, ESP with a trust because you don't own things in the trust.
Wife / anyone else can use suppressor as long as they're trustees. ETA: you *should* keep it secure when it's not with you / a trustee though.