Here's my bad luck Backcountry Breakdown Story for your entertainment.
About 15 years ago I was on a Camping/Fishing trip with a few friends up a dead end road that terminated near the inlet of a lake here in Colorado. It was about 4 semi-rough miles from the nearest maintained FS Road. It didn't require 4WD to access, just a little clearance. We had gone to this exact a spot a handful of times over the years and it used to be a numbered FS Trail.
We saw nobody else camped in the area on our way in (Colorado was a different place even just 15 short years ago). A day or so into our trip we heard a lot of Chainsaw noise in the distance but didn't think much of it until the day we tried to leave. Going back down the road my heart sunk when I saw a row of massive dead trees laid across the road, all recently cut with Chainsaws. There was one every 100 ft or so, and we literally couldn't believe what we were seeing. Foolishly I tried to four-wheel my SUV around them and on one of the first attempts I heard a loud bang like a gunshot and then the vehicle wouldn't go forward or in reverse. One of the CV Axles had literally exploded and seized. We found one of the ballbearings buried about an inch into the dirt below the axle as a result of the explosion. We started walking down the road and within a few miles we ran into the Forest Service Crew with the Chainsaws and told them what happened. I was pretty upset that they had blocked the Road like that without checking to see if people were back there first, and the Supervisor informed us that the Road had been closed to vehicles recently. This was news to me of course since we'd been going there for years and there were no signs indicating this. They walked back up to the vehicle with us and the Supervisor stopped at one point and said the road had been closed beyond this point and picks up one of those flimsy Carsonite Markers laying in the grass off to the side of the Trail that indicated the road was closed. Someone had clearly run it over with an ATV, the ATV tracks were even still there if I remember correctly. They ended up calling a Tow Truck for us and several hours were spent hooking up chains to these trees they had just laid across the road and dragging them out of the way in order to gain access to my vehicle. Once the tow truck hooked up to my SUV and started pulling it the siezed axle broke free and I was able to just drive out in 2WD. He still charged me $800 to come all the way up and help yank trees out of the way. Also, to add insult to injury, the Forest Service Supervisor guy then ticketed me $75 for driving on a closed road. EVEN THOUGH the closure was new as of that Spring, the only Marker indicating this fact was laying down broken on the side of the road which he clearly saw with his own eyes, and the fact that they failed to do a courtesy check up the last few miles of the Road before they just started Merrily dropping mature sized dead trees across the Trail.
So in addition to your battery booster and Jumper cables, bring a Chainsaw.