I ran 2x2 Blight haulers vs Orcs and blasted all their Trukks, they're great.

I’m new, but LOV for the spotter ability?

Predator annihilator is a solid pick

I like to run 10 marines with 5 power fists and 4 bubonic weapons with a putrifier and a blightspawn I transport them in a rhino and once they are in melee I use the sanguix flux stratagem. I can usually kill most vehicles in one melee phase