Doug. You hit the nail on the head! Breaking down miles from anywhere can be a disaster for you & your riding buddies. Being self-sufficient is the key. I am not sure of any web sites specifically that covers survival techniques on the trail although the following suggestions on things to bring on every ride from our club may assist albeit very comprehensive) in your selection: “Small personal First Aid Kit, front and rear (or 19”) tubes, puncture repair kit, tire levers and pump, set of spanners to suit your bike, throttle and brake cables (if appropriate), clutch and front brake levers, gear lever, epoxy repair kit, tape, short length of wire, tow rope, small length of chain, joining link and chain breaker, waterproof matches or lighter and DWF fluid. All these items can be stored on the bike and take up little room if packed properly”. I certainly don't take ALL this stuff although basics such as wheel nut spanners, tire levers (Metzler are the best) & a tube (usually a front as it will fit in the back) is essential. You can share the load by splitting up all you carry between your group of riders although there is nothing better than being fully self sufficient. Prevention in the first place is the best advise, as it will diminish the risk of any problems on the trail because if the bike is well maintained & all items lubricated, failures are likely. Make sure all spokes are adjusted & bolts & nuts are tight. I use Loctite 222 on all threads as it is still easy to undo although won’t shake or vibrate loose. I changed a lot of bolts & nuts all over to stainless Allen screws (socket headed cap screws) so I could get away with as few tools as possible. I keep these in a small roll in a small tool bag on the rear fender. Alternatively, many riders use a fanny (bum) pack. If you’re handy with a welder, you can cut & shunt some spanners & tools together to make your own custom multi tool that fits your bike. I carry a spare clutch & brake lever - takes up little room & light. You can Zip-Tie to the bike frame somewhere also. Same with spare cable(s). Just route them under the tank & seat so there out of the way. Then again a well-maintained cable shouldn’t break. Run heavy-duty tubes (Metzler or Bridgestones) & keep air pressure appropriate for the conditions (higher in rocks) & you are less likely to get a flat. I carry a few Power Bars & a space blanket in case the worst happens & you’re stuck over night. These things are small & light & could save you life. As a real test, use only the tools you carry on every ride to do the basic service work on your bike. If you can do this then you know you’ll be able to look after your baby blue in the middle of nowhere. If not, reassess what you carry. Also, to test your skills a little further, & to build your confidence, do this: Next time its raining at home, take your bike out of the shed & let the air out of one of the tires. Then, in the rain, proceed to use the tools you have on the bike or in your pack to change the tube. It’s a **** of a job although if you can do it you won’t be so worried about it happening on the trail!! Good luck!