I run 19.5s on my truck and don't carry a spare. The place where my spare tire used to sit has been taken over by my Kelderman system's air compressor and other gear. I don't lose any sleep over it, the 19.5s are a lot more durable tire than the LRE tires they replaced. YMMV, but I'd venture to say you can get by without a spare. Like GTO66, I carry a battery impact. Makita XWT08Z, but it makes sense for you to grab whatever you have batteries for. I know that the Makita addresses 140# lug nuts like they're absolutely nothing.
