"Trading Post" is the area for posting up items that you already have and are willing to trade.
"Wanted" is the area to post up requests for items that you do not already have, but want to obtain.
To add to Harry's comments, please do not post the same item in both the Trading Post and Wanted sections. Pick either one based on the rules Harry posted and people will find it.
If you change your mind and add something to trade for what you want, please ask a Mod to move your post from one section to the other, or you can delete your old post yourself and start a new one.
For grey area items, please do not post the same thing in both the Model Cars and Model Trucks Trade/Wanted sections. Pick one section, whichever you feel fits your item best, based on the category designations.
Motorcycles, boats, snowmobiles, ATVs, bicycles and other items which are non-car/truck items, but still automotive kit-related, should be posted in the Model Cars: Trading Post or Wanted sections. Parts and accessories/parts which can be used on both cars and trucks, such as emergency vehicle light bars, tires, wheels, engines, and decals should also be posted in the Model Cars: Trading Post or Wanted sections unless they are kit parts sourced from a truck kit or are a part which is normally used on a model truck. For example, if you're looking for a Detroit Diesel engine, a set of mudder off-road tires, a headache rack, a topper, an axle truss, Rubber Duck hood ornament, or a wrecker boom, those all should be posted in the Model Truck Trade/Wanted section.
If you're unsure about where to post or have any questions, please PM a moderator and ask one of us.