I'm gearing up for some fall and winter camping this year. Which I'm quite used to, however I'm finding the largest annoyance in my trips has become wood processing.
For the past while I've been using a folding hand saw and an axe as my combo. I'm pretty fast but even then it shaves away a lot of the time I'd rather spend otherwise.
So I've resolved to buying a chainsaw for my camping wood processing.
You'll need to make sure that the area you're camping in allows them- not every place does, and you can be fined for using one in many of the areas that do not.
In the areas that allow them, they are typically only allowed for use on wood that is already dead and down, so don't expect to be able to fell standing trees, even dead ones. Standing dead trees are an important ecosystem and habitat resource, and stumps are a detrimental visual impact for most regardless of whether the tree was alive or dead when cut. Felling them is also pretty dangerous anyways, and you'd be an idiot to try to fell a dead tree without really knowing what you're doing.
You also need to think about safety. If you're unfamiliar with chainsaw use, I would seek out at least some minimum level of training, even if it is just something as simple as watching youtube videos on proper chainsaw use. If the chainsaw catches and bucks and you're not properly prepared, you can ruin your trip real fast, and in a remote area, chainsaw injuries can easily be life-threatening. This includes personal-protective-equipment- I would at the very least invest in chaps and face/eye protection.
With that being said, there are a lot of decent small chainsaw models that can be good for cutting up firewood. Green Yard reputable companies that are used by professionals.