As of 3050 the IS only have access to two Quad Mechs. The
Scorpion and the
Goliath. Only 3 Clans have Quads. They are
Thunder Stallion,
Snow Fox and the
Fire Scorpion. 2 of these clan would not gain worlds in the IS until after th Clan Invasion was over. The third would not make it into the IS until 3071. More Quad designs start trickling out of the factories starting in the mid 50s.
As for 100+ tons mechs I believe there are only 2 deigns ever made.
The first was the 150 ton
Superheavy BattleMechs named the
Omega was produced in the 3070s. The Factory on Terra was destroyed during
Operation SCOUR. The bulk of these 'Mechs were deployed in and around the Devils Peak command post used for
Precentor Martial Cameron St. Jamais' final stand, but some
Omegas also saw service around Hilton Head and in Cairo.
"all of the prototypes produced by Skobel are believed to have been destroyed in action."
The second was the 135 ton
Superheavy BattleMechs named the
Ares unique tripodal chassis was produces in 3132. Non were ever seen and are rumored. The video is a fan made video. The Battletech timeline is not up to this time period. So we will have to wait to see if they are really made. the description on Sarna does say
"The Ares represents a series of 'Mechs that are built to exceed the 100-ton mark." Does this mean there are other Superheavy BattleMechs? One unique aspect of these 'Mechs is that they are manned with three personnel.