My advise is to simply break up the package....rc10gt, engine, radio on Ebay. Most people do not want RTR's, or if they do they dont want to lay down the coin for what its really worth. I believe you will actually get more money if you break it up into seperate auctions.
Also just a word of advise, if you sell things on any forum, make sure you get your payment first, The thing I like about ebay is that every auction is insured by Loids of London. Trust me I actually had a deal go bad, and had to go through the process of getting insurace to reimburse me, took a few months but got my money finally!