As your RV is so new I'll assume it's not a worn weather seal. I'm also going to assume it's like any RV door striker I've messed with, although I can't remember when the last time was.
Yes, you should be able to adjust the striker. If it's like any I've seen it's on a concentric so loosening the screw (in the middle of the end) will allow you to move it, or the post may have "flat spots" on it allowing you to turn the entire post with a wrench. Be careful, however, not to loosen it anymore than you absolutely need to. If it comes apart it will be a major pain to get it back together. It will also be frustrating as it won't just move back and forth, or up and down, as you might want it to, it will rotate around the concentric washer you can't see inside the door jam. In other words, it will go up or down a bit when all you really wanted to do was move it in, or out. You may need to futz with it a bit.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
2017 GMC Acadia toad