Keep one in the Tahoe. Bought a tub w/lid from Depot to store it all in.
Mainly set up for roadside breakdowns.
100' 3/8" rope (anchor rope I had), 25' snatch strap, assorted tools, some ratchet straps, bungees, zip ties, gloves (multiple pairs), flares, tire iron, spare hub kit for trailer, folding shovel, machete, flat fix, 12V tire inflator, rags, paper towels, hand cleaner and I know there's more but need to do an inventory. This should get you started.