So, I have previously done a Submersible Light Cruiser Battlegroup based on a Rapier Hull displacement (and therefore transportable in the Rapier cradles)
https://bg.battletech.com/forums/index.php?topic=51927.msg1198264#msg1198264And it included a 100T support WIGE with a light vehicle bay and some support equipment
https://bg.battletech.com/forums/index.php?topic=51479.msg1187731#msg1187731I would suggest that you cannot make a 100T support vehicle with a light vehicle bay or a 200T support vehicle with 2 light vehicle bays that also performs as a credible combat unit, you've simply surrendered too much load to the key systems and the cargo space. It's simply too much transport vehicle to also support a credible combat platform. As such there are 3 plausible paradigms I see
1 - Separate transport and combat elements - have the WIGE's designed much like the Nessie as a non combat unit and provide out of combat support for in combat units. Either the units being carried by the WIGE's or additionally dropped units such as other orbitally dropped WIGE units. Transporting a medium vehicle company would require twice the weight in WIGE support
2 - Big WIGE, small carry - a 200T WIGE with 1 light vehicle bay and a small amount of cargo could possibly mount armour/weapons to credibly take on a medium combat vehicle in direct confrontation. A Medium vehicle company could require up to 4 times the weight in WIGE support
3 - Token combat transports - Like option 1 but with token weapon systems instead of secondary support equipment - e.g. remove the lift hoists and cargo bay from the Nessie and fit 10T of armour and weapons. You could mount "sufficient" combat payload but loses against serious combat units would be grievous