Catalyst Game Labs has some new Battletech Technical Readout books available on their website.
From the release:
MechWarriors receive all the glory; aerospace fighters are a close second; vehicles are considered the workhorses of any military; infantry are even given their day in the sun in the minds of the common citizen. But no battle could be waged, nor won, without the mammoth apparatus of support vehicles that feed the war machine of the Great Houses. From cargo trucks to tanker airships, airborne MASH to communications satellites, armored transport rails to coastal patrol boats, hauler exoskeletons to AgroMechs, even hover and wheeled police cruisers or civilian vehicles conscripted to the military: the support vehicle is the true backbone of any military machine.
Built using the construction rules in TechManual and Tactical Operations, BattleTech Technical Readout: Vehicle Annex provides a never-before-seen look at the support vehicles behind the militaries of every faction, as well as a slice of daily life in the BattleTech® universe. This revised edition has been updated with an overview of the Jihad and Republic era, up to 3084, covering its effects on support vehicle production and various efforts to use them as weapons of war.