1) Family isn't gonna bury the remains, he would be buried in field in a marked grave.
2) What do you think happens to guys who are hit by artillery and such. Running over a dead body is no different in terms of the body being destoryed
3) Tanks in WW1 and WW2 very very commonly ran over enemy infantry as a tactic. Russian tanks would also drive over foxholes and then turn over them, collapsing the hole and burying people inside alive. Also one of the best tactics against a close in surprise attack by an anti-tank crew was indeed to simply charge the gun, if you survived the first shot, and run it over, killing or forcing the crew to flee.