...long story short, my rigger has a Roadmaster armored transport vehicle in his Automotive Facility, and intends to build it into a last resort assault/extraction vehicle for special occasions. My team is being asked to run some simulations on a corp security system (i.e., we can afford to go completely Pink Mohawk, since it's all simmed) and I think it's the perfect chance to bust out the "Rhino" and make the GM cry a little, turnabout being fair play and all.
I'm still kicking around loadouts, but I'm thinking seriously about using a GE Vigilant Light Autocannon as the main armament, with missile/rocket tubes on the sides and a grapple launcher on the back, for towing-related mayhem. The Vigilant has got the firepower to be a real threat to most things on the battlefield, is reasonable on Availability and Cost, and shouldn't be completely unbalancing like a heavier weapon might be (which keeps the GM from re-balancing me from orbit). I'm still looking for a good variable-warhead launcher to mount; Ideally I'd like to have AV, AA, and Frag munitions to use when the situation demands it...they're expensive enough to keep the mayhem down to a reasonable level, and flexible enough to save my bacon from all sorts of nasty stuff. The grapple launcher is pretty much for laughs, but I can see a nice overpowered Roadmaster ripping a fence clear out of the ground, or dragging a pursuit vehicle into the corp's fountain/private jet/fuel depot.
I'm sure you guys have better dream builds - what's your loadout look like?