Looks like a fun toy. Will it give you an afternoon of fun on one charge?
So it's good for a short trip, a run through the local hills, or into a bush destination and back, but it's only going to run flat out with both motors for half an hour or so. Then you'll need a spare battery or a 3-6 hour recharge depending on your charger.
(Or you could leave it in the sun for a week or two to recharge on the 15 watt trickle charging solar battery charger... ;-)