Volga Class Transport.

Length - 715 meters
Displacement - 780,000 tonnes
Crew Compliment - 280

Built on the same hull as the unsuccessful Quixote class frigate the Volga transport was a cheap, easily built work horse that was built in civilian shipyards rather than military ones.  Although armed and armoured like a warship the Volga was slow, cumbersome and had a poor heat dissipation system that barely let it use half its armament.  Still despite this they were built in their hundreds and served as a reliable if cumbersome transport for equipment and Mechs, their four dropship capacity making them viable assault transports as well.

Here you can see the Clan Hells Horses Ship (CHH) Mount Olympus awaiting her dropships arrival before she jumps to another system.

art by the AMAZING mattplog.deviantart.com/