my brother is home on leave and he is sitting right next to me
he said it is a 500 lbs bomb, either barried in the ground or on the side of the road. the reason for putting it in the ground is to take out our tanks belly which is the least armor. as you can see in the video. also notice that clump of trees they used to as a reference point as soon as the tank reached those trees...

he goes back to that hell hole on monday, wish him luck.