A couple of heavy duty 2" ratchet straps and a couple smaller ones. I have been able to hold major components in place long enough to get back to the hard road. Wreckers are a lot cheaper from that point.
I will need to review this list for currency but this was my truck kit.. spare belts/filters basic tool kit spare h/light and d/light globes fuzes cyalume sticks (red green and blue) disposable overalls orange safety vest (so as not to get run down changing a tyre, we do't wear 'em shooting here) Glock folding shovel small axe/large Fiskars axe folding bush saw tread plates various folding knives (no fixed blades due to silly laws) cam cream water/food for about three days Milbag filter/water purification tablets thermal blanketx2 large tarp hootchie hexi stove and fuel small fry pan, steel canteen cup/canteen concentrateddisinfectant basic (to match my skill level) first aid kit plus additional wound dressings snatch strap 3000kg drag chain, hooks and shackles Wallaby Jack (on external rack) Winching kit for the jack Wallaby Jack adapter (connects wallaby jack to bullbar or rear bar) small compressor toilet paper, several rolls and single packets (beats the hell out of leaves and sticks) matches (in bulk) including waterproof/windproof type Para (550) Cord x 50m Hootchie Cord x 100m cheap nylon 6mm rope 50m Couple of torches and spare batteries (Magcharger Torch in charger when on a trip) Wet/Antiseptic wipes (for when bathing is out of the question) Antiseptic soap eye/ear protection condoms (my other 1/2 looking over my shoulder noted these were out of date) playing cards (a sign of a man who has been up "that" creek without his paddle in the past...!!!) M65 Jacket, gloves, balaclava, socks. Belleville boots towel pillow sleeping bag (US modular sleep system complete) tubeless repair kit 100 CDs (these complement the playing cards when stranded, other 1/2 just noted music selection was crap....she has been directed back to the kitchen) Duct tape, insulation tape and cloth tape a second spare tyre and rim telescopic fishing rod and reel plus associated gear bush shower bag lots of large plastic bags unfilled sandbags Arktis patrol pack (just got an Eagle Becker Patrol Pack that I am sorting out) riggers gloves nomex gloves insulated beenie gortex jacket (British DPM) fire extinguisher (cage mounted) canvas swag jumper cables (stopped carrying the APU when I got the second battery). Which extension strap tree trunk protector chamois (cleaning windows and also makes a useful "towel" for me if I need to pack out) candles (both full size and "tea light" kinds) army KFS set lighters zip ties (and something that looks remarkably like flexi-cuffs ) black window socks (pull over the upper door frame to create a shade effect, lest you sleep with the windows down without getting attacked by bugs/squitos) EPIRB Sounds like heaps I know, but it all resides in the side compartments of my "Crusier", under the back deck and in a medium size sealed top plastic tub in the cargo bay. Due to the laws out here there are no firearms/ammunition carried except when I am going away hunting or to the range