I remember the days when we were 30-40 miles offshore in my buddy's Bay Stealth just like yours. It is more than capable in the right conditions and with the right captain.
Ditto to the above comments on safety gear, radio and reliable equipment. I'd add.... (and I'm basing this off of assuming you are new to offshore?) Start out close until you get more comfortable. Don't get too brave too fast. There is lots of great fishing to get started out offshore within 5-9 miles. If you haven't been caught in an "out of nowhere" storm cell offshore...YOU WILL if you go out on a regular basis. Be sure you know how to handle a storm cell situation and don't panic if you end up in one. It's different getting into one offshore vs the bay.
Also (because this has happened to me once)...you said 10-20 miles. On a normal day you can see land at 10 miles, no problem. You get out 20 miles (21 mi to Liberty Ships which has many boats like yours there regularly) you can't see land. If you can't navigate back by compass if your GPS system goes...
it could be a bad day. Learn to navigate by compass before going offshore!! Don't rely 100% on electronics...they WILL go out at the worst possible time.
Once you get the feel for it though you will be fine in that boat if you pick your days. Heck our first Texas blue marlin we caught from that Bay Stealth about 18 miles offshore. It was only about a 90 lb juvenile but having caught it from a bay boat... it was like a grander to us that day. Have fun and be safe. Maybe we will see you out there some day if you run out of Port A.