Infantry/BA don't pay movement for spotting, so that helps a lot. Use at least one Epona A, plus your mad dog and timber wolf = lots of indirect LRM goodness.
The Epona E can ruin someones day, with the pair of plasma cannons (2d6 heat each!) and 6 AP Gauss rifles to crit seek.
The Epona B with a UAC/10 and 2 SSRM4s is also a great one for making holes and exploiting them.
If it was me, I'd think about a Prime, A, B, and E. Mount the elementals on the eponas (No penalty) and drop them off behind cover (break LOS if possible). The fire moth should keep the elementals onboard, as they double its armor, but keep moving.