Ah, Battletech has some pretty sensible tank designs despite the system making tanks not as capable. In this case, say hello to the Gürteltier, or as I like to call the 'Guert'. The standard variant is armed with a gauss rifle, an IS ERPPC, a Multi-Missile Launcher 7, and three machineguns for pesky infantry with all the explosive ammo located in CASE bins. Oh, it has a targeting computer, a C3 Slave system, and an ECM suite, you know just for kicks.
As some of my fellow Battletech players said when I showed up with two of them, they said they were disgusting (in Alpha Strike, it has 12 armor pips, 5 structural pips, and deals 4 damage at all ranges).