While I did not think of just carrying them as cargo, that will work for now. The Mercs are currently on a Garrison (training) mission to earn some cash, but I will have to think of something for the future. They are supposed to be a raiding/striker force consisting of five 'Mechs, three ASFs, six Vehicles (all light), two Battle Armor Squads, four Conventional Infantry Squads, and two Support Vehicles (one heavy, one light). So it looks like a Seeker is my best bet with that, assuming of course that they do not get any bigger.
The other unit I have, for the upcoming campaign, is a Blakist Level III. My thoughts immediately went to the Assault Triumph to maintain faction purity, but the load-out made no sense. The reason I say that is because after looking at Blake Documents, of the 52 Divisions in the book, only 28 have listed compositions. Assuming they still use the composition table from pg. 9 of the ComStar:FM, a full 17 of those Level IVs do not even have enough Vehicles in their TO&E to completely fill the vehicle bay of this Level III transport. Why would such an offensively natured faction create such an offensively natured DS, that seemingly only carries defensive formations?