RE: difference between 2 trucks?
The GT2 RS is the RTR (ready-to-run), while the regular GT2, the Factory Team GT2 is the top of the line GT2.
The RS comes with everything you need except 12 AAs, a D-battery and fuel!
The FT GT2 is a kit, you have to put it together yourself, but it contains all of the Factory Team upgrades that you would normally have to buy afterwards if you were to purchase the GT2 RS.