The energy required to fragmentize the entire body of a Scorpion or a Wraith is 8-C. I did the calcs; Scorpion is 66 Metric tons of Titanium, which fragmentising that would be around 3 Gigajoules. And same with Wraiths, they're made of 45 tons of Nanomalite, which is similar to Titanium; it's stated to have the same heat capacity and density. Energy required to fragmentize a Wraith through sheer force is only around 2 Gigajoules.
Also, Scorpion Tank Shells were calc'd at Wall level. 90mm x 970m Tank Shells are 19.39 kg, and fire at a muzzle velocity of 822.96 m/s. 0.5 * 19.39 * (822.96)^2 = 6,678,885.5 Joules. Which is 9-B. Ramming speed of various vehicles are also calc'd in that range.