The water bag things are pretty cool. Obviously, since you won a 2WD truck, you can appreciate what four or five hundred extra pounds over the rear axle will do for you. Not sure what they cost but if they are kind of spendy then just put whatever you want back there as long as it's heavy. My dad used two large pieces of railroad track to smooth out the ride in his 3/4 ton truck. Worked pretty well after he found a way to secure them and keep them from sliding all over the place back there.