I tested the RPG against all ground vehicles; here's where to shoot.

Taken straight from my Steam notepad.

TL;DR:

• Try to hit tanks in the very back of the body, not the turret. Rear shots from the side don't count. Takes 3 RPGs minimum. • Shoot Urals in the gas tank/door if you're on it's left, and in the engine if you're on it's right. It takes 1 RPG if you shoot these spots. • Hit armed Humvees anywhere but the back, but it'll always at minimum take 3 RPGs. • Hit base Humvees anywhere but the back, 2 RPGs to the sides or front of an unarmed Humvee to set it on fire for a kill. • Shoot Light Vehicles anywhere. Takes 1 RPG. I spent a day testing the RPG vs all the ground vehicles. The RPG kinda sucks against ground vehicles other than light vehicles and Urals. RPGs need a serious buff. There's not even an anti-personnel use-case because the RPG can't one-shot anybody wearing level 1 armor and above on a direct hit.

RPG HtK (Hard->Soft)

Target Hardness Ratings on GROUND TARGETS

RPG vs TANK (1)

• 8 in front turret • 6 in side turret [5 for fire] • 6 in rear turret [5 for fire] • 8 in front glacis • 6 in side [5 for fire] • 3 in rear RPG vs SPG (2)

• 5 in front turret • 5 in side turret • 3 in rear turret • 5 in front glacis • 6 in side • 3 in rear RPG vs HUMVEE (UP ARMORED) (3) (MG+MINI)

• 3 in front grille • 3 in left side [door shot] • 3 in right side [door shot] • 4-5 in rear [VERY INCONSISTENT] • 3 in gas tank/cap [2 for fire] [I tested both, same] RPG vs HUMVEE (4)

• 3 in front grille [2 for fire] [Profile shots are same] • 3 in left side [door shot] [2 for fire] • 3 in right side [door shot] [2 for fire] • 4 in rear • 3 in gas tank/cap [2 for fire] [Two of them. I tested both, they're the same] RPG vs URAL DEFENDER (5)

• 4 in front grille [3 for fire] • 1 in right engine side profile • 2 in left engine side profile [???] [just shoot it in the gas tank] • 1 in left side [door shot] [near gas tank] • 2 in right side [door shot] [1 for fire] • 9 in rear [8 for fire] • 4 in box [???] [tested left and right, same] • 1 in gas tank [can hit this from right side but practically impossible] RPG vs URAL (6)

• 4 in front grille [3 for fire] • 1 in right engine side profile • 2 in left engine side profile [???] [just shoot it in the gas tank] • 1 in left side [door shot] [near gas tank] • 2 in right side [door shot] [1 for fire] • 2 in rear cabin • 7 in rear • 5 in box [???] [4 for fire] [tested left and right, same] • 1 in gas tank RPG vs LIGHT VEHICLE (7)

• Bobcat: 1 • Dune Buggy: 1 • Kodiak: 1