Judging by the motor's kV, you'll want to run the truck on 4S LiPo. This means that the battery used must have 4 cells in series (at 3.7V per cell).
As it has two battery trays, I'd use two LiPos designed for 1/10 scale in SERIES.
The wiring diagram will look like this:
For batteries, I'd use some of Trakpower's new Dark Series packs (the 7.4V 5000mAh 40C ones), or some Thunderpowr 40C 5000mAh LiPos, or some Intellect/IP 5000mAh 30C+ LiPos. The 5000mAh bit is the capacity. All of these LiPos are '2S' - they have two cells wired in series. As you need 4S, you need two of these wired in series, so you'll have a 14.8V 5000mAh pack. The two LiPos must be the same age (IE how many cycles (charges/discharges)), and have the same capacity and discharge rating (the 'C' rating).