Classes used in this video
Ranger 0:19
Air Raider 16:59

This is a long video. I had to use the Ranger and Air Raider because they can summon tanks. I don't use the tank for its firepower though - the tank is fast, and I used it to kite the spiders and Colonists around the map. Because this is Inferno and I have to play extremely safe, the video might be boring, but it's a viable strategy. With the Ranger I had the sentry turrets to deal damage to the spiders that were chasing me. With the Air Raider I was calling in air strikes for fun and his portable flame thrower bomber because spiders flinch from fire. I was using his Decoy to keep the heat off of me.