I made a Triton with 2 doors some time ago, too. There is ONE huge problem with it: Melee enemies in terror missions. On harder difficulties it is problematic to defend one door alone, with two you are completely open to melee attackers AND grenades. It became so dangerous that I removed the second door again.
Maybe (seeing you are good at MCD editing) remove the Triton doors completely and give it a 2-tile door at the back like most IFVs or APCs have?