I've been researching options for solar power for our small R-Pod travel trailer.
Renogy is a proven name in the industry. Look at installing a "full sine-wave" inverter. MPPT chargers are the way to go as well. Tilting solar panels will bring in more power on short winter days but it's a trade-off.
Also, try to concentrate the heavy items like batteries and water tanks towards the front of the trailer to avoid fishtailing.
Many people install "FAN-Tastic" roof fans to provide ventilation. Some models even have rain sensors as well as reversible fans. They are relatively easy to install.
If you decide to install any windows, look at dual-pane RV windows, They will reduce noise and provide much better thermal insulation.
Hope this helps. Nice trailer you got. Sorry to hear about the accident. I know how it feels. I bought a new 4Runner, 2 years ago. Hit a deer on the way home from the dealership, same day I bought it.
.
Good luck.