Just my personal opinion.
If you have any inkling about keeping this trailer for a while...
RV Armor
https://rv-armor.com/rv-armor/?gclid...SAAEgIrEPD_BwE
This is USA only
If you're a DIYer
https://www.superiorrvroof.ca/
This can be purchased in Canada or the USA
I would also think about any potential upgrades to air vent fans like the fantastic fan or the like, maxxair type covers, antennas, solar panels etc.
I don't think any bullet roofs are walkable, so maintenance is not needed with either of these products.
It was one of the main reasons why I have traded mine in. Liked the layout, was comfortable, towed well.