Autotrader.com, motortrend.com, and edmunds.com (for price info only) are good places to start.
You can compare and purchase ford trucks online at most dealerships websites. However, if you want to compare a different make to a ford then you would be better off to go to a site like the Kelly blue book site: www.kbb.com.
Consumer Reports offers comparisons between trucks. There content is available online or in print.
There is a brand called Fast Trucks. These can be bought online at sites like eBay and Amazon. If you are looking for trucks, as in fast automobiles, you should be able to compare online and shop at your local dealership.
While it depends on the specific model, GMC trucks are generally priced lower than Ford trucks. In several online reviews, GMC trucks typically perform better than Ford trucks.
The best way to compare costs of moving trucks is to go to www.expediamoving.com or www.moving.com: compare moving truck rental companies online. This will bring up a list of various sites that will help you to get the best rates.
You can find used trucks online at www.autotrader.com.
The Ford F-150 is always a competitor to other trucks. The Dodge Ram is also another close comparison. There aren't many listings for trucks that compare to these trucks besides the obvious leading brands (Ford and Dodge).
Consumers Reports offers a site that allows users to compare prices and features of trucks. There is a free and paid version of this site.
UsedCars.com is a good source for information and they have a KelleyBlueBook value finder tool that will help you compare prices. CarFinder.com and Edmunds.com also have great information and links to great online car sources.
There are many online shops that provide used trucks for sale. Amazon.com is one of online shop that provides used trucks for sale with any kind of models. You can visit www.amazon.com
There are many for cars but for trucks I'm not sure.
You can go to auto.com and search for used or new trucks in your area.