Congrats on the new toy! They can be a good way to explore the hills without tearing up your truck. That's why I have one. It's basically like a jeep for me, with great suspension that allows me to access areas throughout rough roads a lot easier.
If you are like me, and are often out on your own without another buddy that has a SxS too, then you will need to bring enough tools and parts that you can fix any of the simple breakdowns or getting stuck. I keep a spare belt, tools, tire patch kit, compressor, spare tire, jack etc. These all fit in an under seat bin (except the spare tire, LOL). I have a 4500lb winch on my Can Am Defender Max XT. So yeah, that's about 3x what the dry weight of the machine is. I also have a small bag that has a couple snatch blocks, tow strap, hitch with shackle etc. for helping out if I need to use the winch to get myself out of a situation.
I'm sure that as I explore more, there will be some more little items that I will want along as well, but for now I have the main items I believe I will need. I've put almost 1,000 miles on my machine and have yet to need the winch or any of the tools, but I know it's only a matter of time.
I also have a car seat in mine so the whole family can go enjoy time in the mountains together. There's an endless amount of extras you can put on yours, and that will just depend on how you want to use it. One item on my wish list is a good light bar, the headlights on mine leave a lot to be desired.