Welcome, Jenn! Love those old Trilliums!
Regarding the stripes, removing old decals can be a chore. It’s best done on a warm day. A hair dryer may help some, but with old, brittle decals I didn’t find it helped much.
The most important tool is a plastic razor (available at hardware stores) with a good supply of blades. Use it to lift the corners and coax it away from the shell as you pull.
Some have had good results with a 3M eraser wheel (available online or at an auto parts store). It’s a soft rubber wheel you put in a power drill and it lifts off decals. On my
Scamp I had trouble with the red dye on the decals getting into the wheel and staining the gelcoat, but it may work better for you as it has for others.
You may find removing the stripe leave a “ghost” image behind of unweathered
fiberglass gel coat that contrasts with the surrounding
fiberglass. Not much you can do about that, which may influence your decision about whether to replace the decals or not.
For wax, I’ve has good results with the Meguiar’s Marine/RV Fiberglass Restoration Kit, which includes an oxidation remover, conditioner/polish, and wax. It’s about $35 on Amazon.
To remove rivets, drill out the center of the top, separating the head from the shaft, using a drill bit the same size as the shaft diameter. You might need a helper to grip the other end with vise grip pliers to keep it from turning (if it’s accessible).
Before you get too deep into cosmetics, verify that your frame is sound and your
axle in good condition.
Trillium frames are vulnerable where the rails curve upward at the front of the cabin.
Best wishes!