I have flown LAX to NAN as recently as 2019. They did weight carry-ons both directions and if over 15 lbs or thereabouts, you were likely to have to check it, even if it was camera gear. I guess they don't always do it because I have seen people say they did not experience it. For checked luggage, just pay for an extra bag. Compared to renting dodgy gear or leaving important stuff behind or upgrading your fare class, it is not that expensive.
For carry-on, and if you are unwilling to gate check, make sure your bag is not over 15 lbs when they weigh it. Photo vest, helpful fellow traveler, helium balloons or whatever. Or hope they don't weigh it and if they do, have a plan B. Be aware that currently their website says only one item in cabin, including personal item. I don't know if that is really true, or if it will remain so, but that's what it says right now.