I was going to suggest that for a legit comparison drop a few troops from an LVT2 and let them, then drive along side of them at 25mph and see just how fast those 180lb paras hauling 150lbs of gears are actually moving.
The LVT2 is barely faster.
Obviously, the discrepancy can be blamed on game play. First off, just how fast can loaded troops sprint? Secondly, how far can those troops sprint carrying 150lbs of gear? Thirdly, just how high can they jump??? Ever see them hurdle a building or a hedge row in a single bound???