I’d go the Milwaukee if you already have that, or the aeg if you want to leave it dedicated to your camper. Both brands share tech as they are all owned by a HK company that includes Ryobi.
I think most of the battery saws I reasonable , personal preference is for a company who’s been in the battery game as good battery tech is harder to develop than good chainsaw tech. Stihl and husky are good saws but Reasonably new to battery’s (stihl seem to have made a meal off it with several different battery styles assuring you can’t share tools)
The other chainsaw that gets a good wrap is ego. Not sure on the saw but there 56v battery tech is considered the best even outperforming Milwaukee in back to back tests .
Although I have a battery chainsaw I carry in the car, for long trips I have a stihl mini boss that has a dedicated space case with fuel, oil , chaps etc that goes on the roof . I figure the day you are really going to need to clear a decent tree (high country ) nothing short a quality petrol saw will cut it