the Slugger 

The Slugger is a self-propelled cannon, which is basically a very, very large gun on wheels.  This weapon is fantastic for defeating armored foes and installations in battle despite the fact that it is very, very slow moving - and hard to stop once it gets going.  The Slugger has these vehicular capabilities: 

.30 Cal Quick-Sequence Machine Gun (a):  a backup of sorts for the Slugger's main gun, this weapon is great for dealing with infantry threats to the vehicle.  This gun can be fired to inflict damage per a +5 weapon in a short burst, or damage per a +6 weapon in a full-auto spread. 

175mm "Slugger" Howitzer (a):  the main feature of the Slugger is, of course, its Slugger Howitzer cannon.  This devastating weapon can fire shells that inflict damage like unto a +9 weapon with each shot, all of which has a scatter effect, damaging everybody within striking (near missile) range of where they hit. 

These caseless, high-explosive M-437A4 projectiles are typically aimed with an infra-red or electro-optical (radar-seeking) range finder that provides the Slugger operator a +1 to hit, and can be fired with exceptional range.  They can hit anything within 35.2 miles, which is effectively visual range. 

Lightning Speed (a):  sort of a misnomer really, as the Slugger isn't all that fast, this vehicular 'power' accounts for the self-propelled cannon's ability to move about under its own power, thanks to a very, very powerful engine.  It effectively has this power at intensity 3, allowing 40 m.p.h. movement. 

Nylon/Titanium Honeycomb Armor (s):  the Slugger is a 29 ton hunk of metal.  Most of this is engine and gun barrel, of course, but all of the Slugger's exterior is comprised of a nylon-coated titanium steel honeycomb armor.  This armor, and the Slugger's bulk, providing it a material strength of 16. 

Quartz-Halogen Shielded Lights (i):  the Slugger is equipped with two front-mounted spotlights that allow it to drive at night - or spot nearby opponents in dark conditions.  These lights can illuminate an area with intensity 8 ability, and have grill-shields that protect the bulbs from up to like damage. 

Self-Sealing, Run-Flat Tires (a):  finally, the Slugger is equipped with six heavy duty, self-sealing flotation tires.  These wheels can withstand up to 12 points of damage before being rendered flat, and they can still be driven on at that point; this makes for a rather bumpy ride, however. 

the Slugger (second issue) 

When the G.I. Joe team was first reinstated, the first heavy duty artillery piece they pulled out of storage was the Slugger.  While they updated its electronics and color scheme (going to a desert camo pattern instead of a forest one), this vehicle is basically the same as its older incarnation.