I like my TRED1100's as a lower-priced alternative to MaxTrax, but all depends on when/where you buy them because they can flip-flop on prices I suspect.
I like a 'transfer shovel' and bought the cheapest one HD had available -
HDX 44 in. Wood Handle Transfer Shovel-2531200 - The Home Depot I just toss mine in the back, I haven't gotten around to buying an 'official' rack mount. I like this over a spade style for faster clearing of snow/debris.
Also, I carry a simple carpenter saw from Ace just in case. Haven't needed it, but I don't really want to carry a chainsaw either.
Hi-Lift can come in handy, but this item has as many opinions as anything else you'll find. If you go this route, I'd strongly recommend the
base and even
Slee's adapter - works well with sliders. Edit - don't want to assume, but for anyone considering this, practice practice practice in a safe environment before you actually need to use this. (I hope I *never* have to use it as a winch)
Fuel, water, yes... Lifestraw and iodine tablets (mentioned earlier) are small/easy inclusions here that give peace of mind. Other fluids? Depends, but I'm sure you're taking proper measures for maintenance and won't be too far from civilization, so may not be necessary. Unless you consider cold sodas in your cool box
Tire patch kit with both plugs as well as valve stem repair parts (some kits are only plugs).
Lastly, I'd recommend a couple of shackles (d-ring or soft) and a 30' tow rope. This way, you might be dependent on another vehicle, but you aren't reliant on them providing the gear. Snatch strap optional.