Well, I hate the idea of anyone giving up their truck. But maybe its the best thing, given the price of fuel.
Most cars can take some kind of trailer hitch, so if you can do that, great. Thats because I think hitch racks are usually the best way to go. Theyre easy to use, theres no drama getting them on/off vehicle, and they come in a variety of configurations. Yakimas DoubleDown four-bike rack ($229), for instance, holds four bikes in an easy-access upright mount. Itll hold most any bike securely, and it tilts out of the way so you can get access to the cars trunk.
Thules Ridgeline ($339) also can take four bikes, and it has a little wider swing on its arm for better back-of-car access. In between the two racks, price-wise, is Softrides four-bike Access ($275), which actually is a really nice rack for the money.
The easiest hitch racks to manage are those that use a tray to hold the bike, such as the Saris Cycle-On ($360). Its a two-bike rack that can accept a two-bike extension, although at that point you have a very long thing sticking out of the back of your car.
Saris also makes a pretty good three-bike trunk-mount rack called the Bones 3-Bike Trunk Rack. At $150, its very affordable, but in time it will leave some wear marks on your car, regardless of how careful you are.
So there you go. Thanks for writing!
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