The HaRACer is nonviable as a AAA platform until hovercraft movement gets sorted out better. As it is, they're much too jittery to hit an aero with any kind of consistency.
As far as other dedicated AAA platforms go, there aren't all that many out there. The only one I can think of that would fit the profile is the Aesir, but that has the issue of mounting LB-X 2's, being slower than dirt, and being Clan tech (mind you, it's also Jihad-era, so by this point WiE and Sea Fox are both selling them to whoever). Additionally, I don't know if I'd call a 55-ton combat vehicle "light".