A trading system is already planned, please take knowledge of incoming features before making a suggestion.(http://mikescnr.com/forum/index.php/topic,33.0.html)
Mike wrote:
- Inventory system: Players will be able to carry items such as medkits, vehicle repair kits and condoms with an inventory system. Items will be able to be placed into vehicles and property safes, and transferred/sold between players.
Concerning the sale of a vehicle, the subject is apparently still being discussed here:
http://mikescnr.com/forum/index.php/topic,4507.msg20109.html#msg20109
If you struggle finding results, I advice you to use the advanced research bar:
http://mikescnr.com/forum/index.phpaction=search;advanced;search=
Regards,
Pacha