Frameless window separated from crank arm needs rebonding with urethane adhesive. Clean surfaces, apply 3M Windo-Weld or Sikaflex 255, clamp, and cure 24-48 hours before operating.
Yes, you can remove inverter/charger and install standalone battery charger. Much less expensive than replacement inverter. Check if inverter includes transfer switch - you may need to address that. IOTA or Progressive Dynamics chargers work well.
When the model sticker is unreadable, you can identify your roof AC through physical dimensions, mounting patterns, control panel style, and Fleetwood's typical equipment specifications for that model year.