Welcome! If you can commit the funds the time the energy, this could be nice.
To add to the suggestions, of course it should be re-sealed. Learn how to do that right with the right products. Tip One: NO Silicone Based Products!!! They may work for awhile but leave a residue that's about impossible to remove so the right products like Dicor and Eternabond will stick.
Tip Two: Get a Furnace Blower. Make an adapter to temporarily seal it to a body opening and use it to pressurize the whole coach interior. Then you can spray soap solution all along every seam and joint from the outside. The bubbles will tell you where any leaks originate. It takes something bigger than a leaf blower or shop vac because there are so many natural leaks in an RV. Fridge Vent, Range Hood, Door Vents in Cockpit to name a few.
