If you have the Chap B Terrain Chart you can look up all the TEM for Indirect Fire. As Legion said, most are the same as direct fire, but if different the chart lists it under 'TEM/Indirect'.
As far as a Dug-in AFV, it isn't considered to be "as if in a trench" (and AFV can't be under a trench counter per B27.55) so it will not receive a +2 TEM for MTRs or a +4 TEM for OBA.
Mark