The shipping container loading crane, will certainly be a favorite spot for a sniper to set up in. It has a pretty massive footprint, yet because of it's open superstructure it is not going to be a huge line of sight blocker...unless you have a container locked in.
The retro Airstream trailer is pretty much a classic that is perfect for any sort of apocalypse game (or a game based off of Tremors). It would be really interesting to try using foil tape instead of painting the exterior of this model. Oxidizing the tape is as simple as rubbing it with steel wool, something I would suggest doing before applying it to the model.
The gas station has ambiguous design lines, so I think that you could get away with using it for any number of time periods (50's on up). Of all the places to have a shootout at...a gas station does seem like the less than optimum location.
The construction office or shipping yard trailer is pretty iconic and a useful piece of terrain to add to the mix. Lathan points out the that light and generator are part of a larger set...but doesn't say precisely what set. So that is something else to keep an eye out for as well!