For a new install in a town this size, the truck carries standard steel and insulated door sections in the common widths, torsion spring shafts and cable drums, track sections for both standard-lift and low-headroom setups, and jamb/header hardware for reinforcing a rough opening that isn't square. Weatherstripping and bottom seals come in a few profiles because the climate here calls for it - this area sits in a cold, moderate winter band, and a door without a decent seal at the floor and jambs loses that fight fast.
What isn't standard on the truck is anything custom-milled - a nonstandard width or a carriage-style door with special hardware usually means an order placed first and a return trip once it's in. On an install, that's the honest limitation: if your opening is an odd size for the era, plan on two visits, not one.