You really want to impress the guys? Mount a 105 mm Howitzer in the back of your truck. Giggity!

This Humvee-Mounted Howitzer Is Here To “Shoot and Scoot”

It uses a special recoil dampening system that works well enough to allow the cannon to be mounted in the bed of a Ford F-250 pickup truck (seems to work about like the Howitzer proposed for helicopter use in the early 70’s).

The idea is to create a system mobile enough to fire off a few shots and then pack up and leave before counter-battery fire comes raining down. Seems to me, though, to really make the system work well it needs to have an autoloader with a magazine of four or more rounds and, preferably, the ability to fire either on the move, or within a few seconds of stopping, and then to get back moving again within a second or two.

Hold muh beer. BLAMMO!