says he's pretty happy with these babes...
From Tabletop Terrain
ZIP File – $5.50 USD
A collection of 3Dprintable files that build a series of towable guns with various barrels. They have been designed to print easily and to work with 28-32mm scale figures. These towed guns can be used for many sci-fi and post-Apocalyptic games. They also work with many of our vehicles.
Moveable parts include split trails that fit together for towing, a moveable breech on the cannon option, and the gun can elevate.