That should fit fine. I have one of the cheap ones from Toys R Us for my niece in there and it fits with plenty of room. I even have a sub-woofer in the back in a custom box that resides over the passenger hump. Not a huge trunk but works fine.
that should fit...the ones with the big wheels i think you will have a problem...
List of Mods
Car: 2008 USB Lexus IS-F
Mods: Joe Z|Toms|Wald|Arkym|BC Racing|OS Giken|Beat Sonic|HPS|FSport|GTSpec|Lexus|iJDMToys|V-LED|Bride|McGards|Junction Produce|Project Mu|Hawks|PPE|FIGS
Teo the "Triad Accountant"