It is getting pretty nasty in there.
Apparently Yakface and John Spencer are split on the deff rolla issue. Yakface says deffrollas can ram, John doesn't.
Anyway, it looks like they've overturned the Inat FAQ.
So now according to Inat, John Spencer, and another FAQ they mentioned, deffrollas cannot be used in a ram.
I agree with Yak though. It is totally over powered, but the RAW says pretty plainly that it can be done.