From page 9 of Alpha Strike 2.4 errata, under transporting infantry:
However, the transport mounted by these units will lose 2 inches of Move per turn as long as the XMEC unit remains on board.
Could the loss of 2 inches move by the transporting unit reduce the transporting unit's TMM? For example, if a unit that normally moves 10 inches (for a TMM of 2) transports an XMEC unit, is it considered a unit with a move of 8 inches with a TMM of 1?
Or, should the 2 inches movement loss be considered in a similar manner to a terrain cost, reducing the distance the transporting unit can move but not the TMM?