Silky Katanaboy 650. Yes it's a hand saw, but it takes up zero room and is always in the van. I can go thru a 16" fir faster then I could pull out my Husky, prime it and get it started if it's been sitting for a year.
I'll still take my gas saw if I'm going to be the first person in an area, or if there's alot of pine beetle kill in the area. But as a backup saw its pretty hard to beat. I've been planning on buying an electric for a few years, but just haven't been able to justify the cost. The Katanaboy was an easy compromise, plus it comes camping if we are based from the boat or close to the van.
I have a Husky 455 Rancher saw for making firewood,
For the unexpected road clearing drill. I keep a Silky Katanaboy 500 behind the seat, along with a Fiskars axe, and a log chain in back of the truck.
The big Silky 500 is no joke, and the 650 is even more of a good thing.
Testing the Silky Katanaboy 500 on roughly a 12" log, it sailed right through.