Hi slippycheeze,
As I see it, the only conflicting modification between Rampant and Truce Mod would be a function called set_cease_fire. This function is called twice by Truce Mod, once at start and once when the timer reaches zero to switch cease fire mode for enemies.
However, the issue you're describing could be a problem with the Rampant mod itself (or possibly conflicts with other mods).
Over at the discussion for the Rampant mod, players are reporting issues with enemies not attacking etc.
In any case, I will look into the issue and speak to the developer of the Rampant mod and see if there could be a conflict after all.
Thanks for your feedback!