Ricochet requires high-stability tank hulls, which means that Dictators and Hornets are not the best choices. Viking is the best possible choice for designing an assault tank for CTF mode. Perfect for both capturing and delivering enemy flags, and for returning own flag. Of course Mammoth is not for attacking enemy base in CTF mode, but it is still good for Deathmatches. As for defending the base it looks like Thunder, Freeze and Shaft are better choices.